From 27965ce5edff20db2de1dd233c88f8393bb0da0b Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Fri, 25 Feb 2022 00:34:14 +0100
Subject: [PATCH] Add trending statuses (#17431)

* Add trending statuses

* Fix dangling items with stale scores in localized sets

* Various fixes and improvements

- Change approve_all/reject_all to approve_accounts/reject_accounts
- Change Trends::Query methods to not mutate the original query
- Change Trends::Query#skip to offset
- Change follow recommendations to be refreshed in a transaction

* Add tests for trending statuses filtering behaviour

* Fix not applying filtering scope in controller
---
 .rubocop.yml                                  |   5 +-
 .../preview_card_providers_controller.rb      |  12 +-
 .../admin/trends/links_controller.rb          |  20 +--
 .../admin/trends/statuses_controller.rb       |  45 ++++++
 .../admin/trends/tags_controller.rb           |  12 +-
 .../api/v1/admin/trends/links_controller.rb   |  19 +++
 .../v1/admin/trends/statuses_controller.rb    |  19 +++
 .../api/v1/admin/trends/tags_controller.rb    |   2 +-
 .../api/v1/trends/links_controller.rb         |   6 +-
 .../api/v1/trends/statuses_controller.rb      |  27 ++++
 .../api/v1/trends/tags_controller.rb          |   2 +-
 app/controllers/concerns/localized.rb         |   4 +
 app/helpers/admin/filter_helper.rb            |   7 +-
 app/helpers/languages_helper.rb               |   2 +-
 app/javascript/styles/mastodon/accounts.scss  |  10 +-
 app/javascript/styles/mastodon/tables.scss    |   7 +
 app/lib/activitypub/activity/announce.rb      |   3 +-
 app/lib/activitypub/activity/like.rb          |   2 +
 app/mailers/admin_mailer.rb                   |  27 ++--
 app/models/account.rb                         |  30 ++--
 app/models/status.rb                          |  12 ++
 app/models/trends.rb                          |  26 +++-
 app/models/trends/base.rb                     |  20 ++-
 app/models/trends/links.rb                    |  52 ++++---
 .../{form => trends}/preview_card_batch.rb    |  22 +--
 .../{ => trends}/preview_card_filter.rb       |  23 +--
 .../preview_card_provider_batch.rb            |   6 +-
 .../preview_card_provider_filter.rb           |   2 +-
 app/models/trends/query.rb                    | 106 +++++++++++++
 app/models/trends/status_batch.rb             |  65 ++++++++
 app/models/trends/status_filter.rb            |  46 ++++++
 app/models/trends/statuses.rb                 | 142 ++++++++++++++++++
 app/models/{form => trends}/tag_batch.rb      |   6 +-
 app/models/{ => trends}/tag_filter.rb         |  10 +-
 app/models/trends/tags.rb                     |  36 ++---
 app/models/user.rb                            |   2 +-
 app/policies/account_policy.rb                |   4 +
 app/policies/preview_card_policy.rb           |   2 +-
 app/policies/preview_card_provider_policy.rb  |   2 +-
 app/policies/status_policy.rb                 |   4 +
 app/policies/tag_policy.rb                    |   4 +
 app/services/delete_account_service.rb        |  32 ++--
 app/services/favourite_service.rb             |   2 +
 app/services/reblog_service.rb                |   3 +-
 .../custom_emojis/_custom_emoji.html.haml     |   2 +-
 .../follow_recommendations/show.html.haml     |   6 +-
 app/views/admin/trends/links/index.html.haml  |  34 +++--
 .../preview_card_providers/index.html.haml    |   2 +-
 .../admin/trends/statuses/_status.html.haml   |  30 ++++
 .../admin/trends/statuses/index.html.haml     |  43 ++++++
 app/views/admin/trends/tags/index.html.haml   |   4 +-
 .../admin_mailer/_new_trending_links.text.erb |  14 ++
 .../_new_trending_statuses.text.erb           |  14 ++
 .../admin_mailer/_new_trending_tags.text.erb  |  14 ++
 .../admin_mailer/new_trending_links.text.erb  |  16 --
 .../admin_mailer/new_trending_tags.text.erb   |  16 --
 app/views/admin_mailer/new_trends.text.erb    |  13 ++
 app/views/application/_sidebar.html.haml      |   2 +-
 .../follow_recommendations_scheduler.rb       |   8 +-
 config/brakeman.ignore                        |  68 +++------
 config/locales/en.yml                         |  34 +++--
 config/navigation.rb                          |   1 +
 config/routes.rb                              |   9 ++
 ...0220202200743_add_trendable_to_accounts.rb |   7 +
 ...0220202200926_add_trendable_to_statuses.rb |   5 +
 ...201015_remove_trust_level_from_accounts.rb |   9 ++
 db/schema.rb                                  |   6 +-
 .../api/v1/trends/tags_controller_spec.rb     |   7 +-
 spec/mailers/previews/admin_mailer_preview.rb |  11 +-
 spec/models/trends/statuses_spec.rb           | 110 ++++++++++++++
 spec/models/trends/tags_spec.rb               |   6 +-
 71 files changed, 1074 insertions(+), 307 deletions(-)
 create mode 100644 app/controllers/admin/trends/statuses_controller.rb
 create mode 100644 app/controllers/api/v1/admin/trends/links_controller.rb
 create mode 100644 app/controllers/api/v1/admin/trends/statuses_controller.rb
 create mode 100644 app/controllers/api/v1/trends/statuses_controller.rb
 rename app/models/{form => trends}/preview_card_batch.rb (82%)
 rename app/models/{ => trends}/preview_card_filter.rb (52%)
 rename app/models/{form => trends}/preview_card_provider_batch.rb (91%)
 rename app/models/{ => trends}/preview_card_provider_filter.rb (95%)
 create mode 100644 app/models/trends/query.rb
 create mode 100644 app/models/trends/status_batch.rb
 create mode 100644 app/models/trends/status_filter.rb
 create mode 100644 app/models/trends/statuses.rb
 rename app/models/{form => trends}/tag_batch.rb (81%)
 rename app/models/{ => trends}/tag_filter.rb (76%)
 create mode 100644 app/views/admin/trends/statuses/_status.html.haml
 create mode 100644 app/views/admin/trends/statuses/index.html.haml
 create mode 100644 app/views/admin_mailer/_new_trending_links.text.erb
 create mode 100644 app/views/admin_mailer/_new_trending_statuses.text.erb
 create mode 100644 app/views/admin_mailer/_new_trending_tags.text.erb
 delete mode 100644 app/views/admin_mailer/new_trending_links.text.erb
 delete mode 100644 app/views/admin_mailer/new_trending_tags.text.erb
 create mode 100644 app/views/admin_mailer/new_trends.text.erb
 create mode 100644 db/migrate/20220202200743_add_trendable_to_accounts.rb
 create mode 100644 db/migrate/20220202200926_add_trendable_to_statuses.rb
 create mode 100644 db/post_migrate/20220202201015_remove_trust_level_from_accounts.rb
 create mode 100644 spec/models/trends/statuses_spec.rb

diff --git a/.rubocop.yml b/.rubocop.yml
index 2af0f59bb..68634e9e3 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -32,10 +32,11 @@ Layout/EmptyLineAfterGuardClause:
 Layout/EmptyLinesAroundAttributeAccessor:
   Enabled: true
 
+Layout/FirstHashElementIndentation:
+  EnforcedStyle: consistent
+
 Layout/HashAlignment:
   Enabled: false
-  # EnforcedHashRocketStyle: table
-  # EnforcedColonStyle: table
 
 Layout/SpaceAroundMethodCallOperator:
   Enabled: true
diff --git a/app/controllers/admin/trends/links/preview_card_providers_controller.rb b/app/controllers/admin/trends/links/preview_card_providers_controller.rb
index 2c26e03f3..40a466cd6 100644
--- a/app/controllers/admin/trends/links/preview_card_providers_controller.rb
+++ b/app/controllers/admin/trends/links/preview_card_providers_controller.rb
@@ -5,11 +5,11 @@ class Admin::Trends::Links::PreviewCardProvidersController < Admin::BaseControll
     authorize :preview_card_provider, :index?
 
     @preview_card_providers = filtered_preview_card_providers.page(params[:page])
-    @form = Form::PreviewCardProviderBatch.new
+    @form = Trends::PreviewCardProviderBatch.new
   end
 
   def batch
-    @form = Form::PreviewCardProviderBatch.new(form_preview_card_provider_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form = Trends::PreviewCardProviderBatch.new(trends_preview_card_provider_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
     flash[:alert] = I18n.t('admin.accounts.no_account_selected')
@@ -20,15 +20,15 @@ class Admin::Trends::Links::PreviewCardProvidersController < Admin::BaseControll
   private
 
   def filtered_preview_card_providers
-    PreviewCardProviderFilter.new(filter_params).results
+    Trends::PreviewCardProviderFilter.new(filter_params).results
   end
 
   def filter_params
-    params.slice(:page, *PreviewCardProviderFilter::KEYS).permit(:page, *PreviewCardProviderFilter::KEYS)
+    params.slice(:page, *Trends::PreviewCardProviderFilter::KEYS).permit(:page, *Trends::PreviewCardProviderFilter::KEYS)
   end
 
-  def form_preview_card_provider_batch_params
-    params.require(:form_preview_card_provider_batch).permit(:action, preview_card_provider_ids: [])
+  def trends_preview_card_provider_batch_params
+    params.require(:trends_preview_card_provider_batch).permit(:action, preview_card_provider_ids: [])
   end
 
   def action_from_button
diff --git a/app/controllers/admin/trends/links_controller.rb b/app/controllers/admin/trends/links_controller.rb
index 619b37deb..434eec5fe 100644
--- a/app/controllers/admin/trends/links_controller.rb
+++ b/app/controllers/admin/trends/links_controller.rb
@@ -5,11 +5,11 @@ class Admin::Trends::LinksController < Admin::BaseController
     authorize :preview_card, :index?
 
     @preview_cards = filtered_preview_cards.page(params[:page])
-    @form          = Form::PreviewCardBatch.new
+    @form          = Trends::PreviewCardBatch.new
   end
 
   def batch
-    @form = Form::PreviewCardBatch.new(form_preview_card_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form = Trends::PreviewCardBatch.new(trends_preview_card_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
     flash[:alert] = I18n.t('admin.accounts.no_account_selected')
@@ -20,26 +20,26 @@ class Admin::Trends::LinksController < Admin::BaseController
   private
 
   def filtered_preview_cards
-    PreviewCardFilter.new(filter_params.with_defaults(trending: 'all')).results
+    Trends::PreviewCardFilter.new(filter_params.with_defaults(trending: 'all')).results
   end
 
   def filter_params
-    params.slice(:page, *PreviewCardFilter::KEYS).permit(:page, *PreviewCardFilter::KEYS)
+    params.slice(:page, *Trends::PreviewCardFilter::KEYS).permit(:page, *Trends::PreviewCardFilter::KEYS)
   end
 
-  def form_preview_card_batch_params
-    params.require(:form_preview_card_batch).permit(:action, preview_card_ids: [])
+  def trends_preview_card_batch_params
+    params.require(:trends_preview_card_batch).permit(:action, preview_card_ids: [])
   end
 
   def action_from_button
     if params[:approve]
       'approve'
-    elsif params[:approve_all]
-      'approve_all'
+    elsif params[:approve_providers]
+      'approve_providers'
     elsif params[:reject]
       'reject'
-    elsif params[:reject_all]
-      'reject_all'
+    elsif params[:reject_providers]
+      'reject_providers'
     end
   end
 end
diff --git a/app/controllers/admin/trends/statuses_controller.rb b/app/controllers/admin/trends/statuses_controller.rb
new file mode 100644
index 000000000..766242738
--- /dev/null
+++ b/app/controllers/admin/trends/statuses_controller.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class Admin::Trends::StatusesController < Admin::BaseController
+  def index
+    authorize :status, :index?
+
+    @statuses = filtered_statuses.page(params[:page])
+    @form     = Trends::StatusBatch.new
+  end
+
+  def batch
+    @form = Trends::StatusBatch.new(trends_status_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form.save
+  rescue ActionController::ParameterMissing
+    flash[:alert] = I18n.t('admin.accounts.no_account_selected')
+  ensure
+    redirect_to admin_trends_statuses_path(filter_params)
+  end
+
+  private
+
+  def filtered_statuses
+    Trends::StatusFilter.new(filter_params.with_defaults(trending: 'all')).results.includes(:account, :media_attachments, :active_mentions)
+  end
+
+  def filter_params
+    params.slice(:page, *Trends::StatusFilter::KEYS).permit(:page, *Trends::StatusFilter::KEYS)
+  end
+
+  def trends_status_batch_params
+    params.require(:trends_status_batch).permit(:action, status_ids: [])
+  end
+
+  def action_from_button
+    if params[:approve]
+      'approve'
+    elsif params[:approve_accounts]
+      'approve_accounts'
+    elsif params[:reject]
+      'reject'
+    elsif params[:reject_accounts]
+      'reject_accounts'
+    end
+  end
+end
diff --git a/app/controllers/admin/trends/tags_controller.rb b/app/controllers/admin/trends/tags_controller.rb
index 91ff33d40..f4d1ec0d1 100644
--- a/app/controllers/admin/trends/tags_controller.rb
+++ b/app/controllers/admin/trends/tags_controller.rb
@@ -5,11 +5,11 @@ class Admin::Trends::TagsController < Admin::BaseController
     authorize :tag, :index?
 
     @tags = filtered_tags.page(params[:page])
-    @form = Form::TagBatch.new
+    @form = Trends::TagBatch.new
   end
 
   def batch
-    @form = Form::TagBatch.new(form_tag_batch_params.merge(current_account: current_account, action: action_from_button))
+    @form = Trends::TagBatch.new(trends_tag_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
     flash[:alert] = I18n.t('admin.accounts.no_account_selected')
@@ -20,15 +20,15 @@ class Admin::Trends::TagsController < Admin::BaseController
   private
 
   def filtered_tags
-    TagFilter.new(filter_params).results
+    Trends::TagFilter.new(filter_params).results
   end
 
   def filter_params
-    params.slice(:page, *TagFilter::KEYS).permit(:page, *TagFilter::KEYS)
+    params.slice(:page, *Trends::TagFilter::KEYS).permit(:page, *Trends::TagFilter::KEYS)
   end
 
-  def form_tag_batch_params
-    params.require(:form_tag_batch).permit(:action, tag_ids: [])
+  def trends_tag_batch_params
+    params.require(:trends_tag_batch).permit(:action, tag_ids: [])
   end
 
   def action_from_button
diff --git a/app/controllers/api/v1/admin/trends/links_controller.rb b/app/controllers/api/v1/admin/trends/links_controller.rb
new file mode 100644
index 000000000..63b3d9358
--- /dev/null
+++ b/app/controllers/api/v1/admin/trends/links_controller.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::Trends::LinksController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action -> { authorize_if_got_token! :'admin:read' }
+  before_action :require_staff!
+  before_action :set_links
+
+  def index
+    render json: @links, each_serializer: REST::Trends::LinkSerializer
+  end
+
+  private
+
+  def set_links
+    @links = Trends.links.query.limit(limit_param(10))
+  end
+end
diff --git a/app/controllers/api/v1/admin/trends/statuses_controller.rb b/app/controllers/api/v1/admin/trends/statuses_controller.rb
new file mode 100644
index 000000000..86633cc74
--- /dev/null
+++ b/app/controllers/api/v1/admin/trends/statuses_controller.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::Trends::StatusesController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action -> { authorize_if_got_token! :'admin:read' }
+  before_action :require_staff!
+  before_action :set_statuses
+
+  def index
+    render json: @statuses, each_serializer: REST::StatusSerializer
+  end
+
+  private
+
+  def set_statuses
+    @statuses = cache_collection(Trends.statuses.query.limit(limit_param(DEFAULT_STATUSES_LIMIT)), Status)
+  end
+end
diff --git a/app/controllers/api/v1/admin/trends/tags_controller.rb b/app/controllers/api/v1/admin/trends/tags_controller.rb
index 4815af31e..5cc4c269d 100644
--- a/app/controllers/api/v1/admin/trends/tags_controller.rb
+++ b/app/controllers/api/v1/admin/trends/tags_controller.rb
@@ -14,6 +14,6 @@ class Api::V1::Admin::Trends::TagsController < Api::BaseController
   private
 
   def set_tags
-    @tags = Trends.tags.get(false, limit_param(10))
+    @tags = Trends.tags.query.limit(limit_param(10))
   end
 end
diff --git a/app/controllers/api/v1/trends/links_controller.rb b/app/controllers/api/v1/trends/links_controller.rb
index 1c3ab1e1c..ad20e7f8b 100644
--- a/app/controllers/api/v1/trends/links_controller.rb
+++ b/app/controllers/api/v1/trends/links_controller.rb
@@ -12,10 +12,14 @@ class Api::V1::Trends::LinksController < Api::BaseController
   def set_links
     @links = begin
       if Setting.trends
-        Trends.links.get(true, limit_param(10))
+        links_from_trends
       else
         []
       end
     end
   end
+
+  def links_from_trends
+    Trends.links.query.allowed.in_locale(content_locale).limit(limit_param(10))
+  end
 end
diff --git a/app/controllers/api/v1/trends/statuses_controller.rb b/app/controllers/api/v1/trends/statuses_controller.rb
new file mode 100644
index 000000000..d4ec97ae5
--- /dev/null
+++ b/app/controllers/api/v1/trends/statuses_controller.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class Api::V1::Trends::StatusesController < Api::BaseController
+  before_action :set_statuses
+
+  def index
+    render json: @statuses, each_serializer: REST::StatusSerializer
+  end
+
+  private
+
+  def set_statuses
+    @statuses = begin
+      if Setting.trends
+        cache_collection(statuses_from_trends, Status)
+      else
+        []
+      end
+    end
+  end
+
+  def statuses_from_trends
+    scope = Trends.statuses.query.allowed.in_locale(content_locale)
+    scope = scope.filtered_for(current_account) if user_signed_in?
+    scope.limit(limit_param(DEFAULT_STATUSES_LIMIT))
+  end
+end
diff --git a/app/controllers/api/v1/trends/tags_controller.rb b/app/controllers/api/v1/trends/tags_controller.rb
index 947b53de2..1334b72d2 100644
--- a/app/controllers/api/v1/trends/tags_controller.rb
+++ b/app/controllers/api/v1/trends/tags_controller.rb
@@ -12,7 +12,7 @@ class Api::V1::Trends::TagsController < Api::BaseController
   def set_tags
     @tags = begin
       if Setting.trends
-        Trends.tags.get(true, limit_param(10))
+        Trends.tags.query.allowed.limit(limit_param(10))
       else
         []
       end
diff --git a/app/controllers/concerns/localized.rb b/app/controllers/concerns/localized.rb
index 173316800..ede299d5a 100644
--- a/app/controllers/concerns/localized.rb
+++ b/app/controllers/concerns/localized.rb
@@ -27,4 +27,8 @@ module Localized
   def available_locale_or_nil(locale_name)
     locale_name.to_sym if locale_name.present? && I18n.available_locales.include?(locale_name.to_sym)
   end
+
+  def content_locale
+    @content_locale ||= I18n.locale.to_s.split(/[_-]/).first
+  end
 end
diff --git a/app/helpers/admin/filter_helper.rb b/app/helpers/admin/filter_helper.rb
index 907529b37..140fc73ed 100644
--- a/app/helpers/admin/filter_helper.rb
+++ b/app/helpers/admin/filter_helper.rb
@@ -5,9 +5,10 @@ module Admin::FilterHelper
     AccountFilter::KEYS,
     CustomEmojiFilter::KEYS,
     ReportFilter::KEYS,
-    TagFilter::KEYS,
-    PreviewCardProviderFilter::KEYS,
-    PreviewCardFilter::KEYS,
+    Trends::TagFilter::KEYS,
+    Trends::PreviewCardProviderFilter::KEYS,
+    Trends::PreviewCardFilter::KEYS,
+    Trends::StatusFilter::KEYS,
     InstanceFilter::KEYS,
     InviteFilter::KEYS,
     RelationshipFilter::KEYS,
diff --git a/app/helpers/languages_helper.rb b/app/helpers/languages_helper.rb
index 3a65af686..f22cc6d28 100644
--- a/app/helpers/languages_helper.rb
+++ b/app/helpers/languages_helper.rb
@@ -242,6 +242,6 @@ module LanguagesHelper
   end
 
   def valid_locale?(locale)
-    SUPPORTED_LOCALES.key?(locale.to_sym)
+    locale.present? && SUPPORTED_LOCALES.key?(locale.to_sym)
   end
 end
diff --git a/app/javascript/styles/mastodon/accounts.scss b/app/javascript/styles/mastodon/accounts.scss
index 485fe4a9d..215774a19 100644
--- a/app/javascript/styles/mastodon/accounts.scss
+++ b/app/javascript/styles/mastodon/accounts.scss
@@ -331,7 +331,8 @@
 }
 
 .batch-table__row--muted .pending-account__header,
-.batch-table__row--muted .accounts-table {
+.batch-table__row--muted .accounts-table,
+.batch-table__row--muted .name-tag {
   &,
   a,
   strong {
@@ -339,6 +340,10 @@
   }
 }
 
+.batch-table__row--muted .name-tag .avatar {
+  opacity: 0.5;
+}
+
 .batch-table__row--muted .accounts-table {
   tbody td.accounts-table__extra,
   &__count,
@@ -352,7 +357,8 @@
 }
 
 .batch-table__row--attention .pending-account__header,
-.batch-table__row--attention .accounts-table {
+.batch-table__row--attention .accounts-table,
+.batch-table__row--attention .name-tag {
   &,
   a,
   strong {
diff --git a/app/javascript/styles/mastodon/tables.scss b/app/javascript/styles/mastodon/tables.scss
index 36bc07a72..1f7e71776 100644
--- a/app/javascript/styles/mastodon/tables.scss
+++ b/app/javascript/styles/mastodon/tables.scss
@@ -210,6 +210,7 @@ a.table-action-link {
     &__content {
       padding-top: 12px;
       padding-bottom: 16px;
+      overflow: hidden;
 
       &--unpadded {
         padding: 0;
@@ -296,3 +297,9 @@ a.table-action-link {
     }
   }
 }
+
+.one-liner {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
diff --git a/app/lib/activitypub/activity/announce.rb b/app/lib/activitypub/activity/announce.rb
index 12fad8da4..7cd5a41e8 100644
--- a/app/lib/activitypub/activity/announce.rb
+++ b/app/lib/activitypub/activity/announce.rb
@@ -23,8 +23,7 @@ class ActivityPub::Activity::Announce < ActivityPub::Activity
         visibility: visibility_from_audience
       )
 
-      Trends.tags.register(@status)
-      Trends.links.register(@status)
+      Trends.register!(@status)
 
       distribute
     end
diff --git a/app/lib/activitypub/activity/like.rb b/app/lib/activitypub/activity/like.rb
index c065f01f8..ebbda15b9 100644
--- a/app/lib/activitypub/activity/like.rb
+++ b/app/lib/activitypub/activity/like.rb
@@ -7,6 +7,8 @@ class ActivityPub::Activity::Like < ActivityPub::Activity
     return if original_status.nil? || !original_status.account.local? || delete_arrived_first?(@json['id']) || @account.favourited?(original_status)
 
     favourite = original_status.favourites.create!(account: @account)
+
     NotifyService.new.call(original_status.account, :favourite, favourite)
+    Trends.statuses.register(original_status)
   end
 end
diff --git a/app/mailers/admin_mailer.rb b/app/mailers/admin_mailer.rb
index a9d00c000..f416977d8 100644
--- a/app/mailers/admin_mailer.rb
+++ b/app/mailers/admin_mailer.rb
@@ -35,25 +35,18 @@ class AdminMailer < ApplicationMailer
     end
   end
 
-  def new_trending_tags(recipient, tags)
-    @tags                = tags
-    @me                  = recipient
-    @instance            = Rails.configuration.x.local_domain
-    @lowest_trending_tag = Trends.tags.get(true, Trends.tags.options[:review_threshold]).last
+  def new_trends(recipient, links, tags, statuses)
+    @links                  = links
+    @lowest_trending_link   = Trends.links.query.allowed.limit(Trends.links.options[:review_threshold]).last
+    @tags                   = tags
+    @lowest_trending_tag    = Trends.tags.query.allowed.limit(Trends.tags.options[:review_threshold]).last
+    @statuses               = statuses
+    @lowest_trending_status = Trends.statuses.query.allowed.limit(Trends.statuses.options[:review_threshold]).last
+    @me                     = recipient
+    @instance               = Rails.configuration.x.local_domain
 
     locale_for_account(@me) do
-      mail to: @me.user_email, subject: I18n.t('admin_mailer.new_trending_tags.subject', instance: @instance)
-    end
-  end
-
-  def new_trending_links(recipient, links)
-    @links                = links
-    @me                   = recipient
-    @instance             = Rails.configuration.x.local_domain
-    @lowest_trending_link = Trends.links.get(true, Trends.links.options[:review_threshold]).last
-
-    locale_for_account(@me) do
-      mail to: @me.user_email, subject: I18n.t('admin_mailer.new_trending_links.subject', instance: @instance)
+      mail to: @me.user_email, subject: I18n.t('admin_mailer.new_trends.subject', instance: @instance)
     end
   end
 end
diff --git a/app/models/account.rb b/app/models/account.rb
index 2ad45feda..dfdf9045f 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -40,13 +40,15 @@
 #  also_known_as                 :string           is an Array
 #  silenced_at                   :datetime
 #  suspended_at                  :datetime
-#  trust_level                   :integer
 #  hide_collections              :boolean
 #  avatar_storage_schema_version :integer
 #  header_storage_schema_version :integer
 #  devices_url                   :string
 #  suspension_origin             :integer
 #  sensitized_at                 :datetime
+#  trendable                     :boolean
+#  reviewed_at                   :datetime
+#  requested_review_at           :datetime
 #
 
 class Account < ApplicationRecord
@@ -56,6 +58,7 @@ class Account < ApplicationRecord
     remote_url
     salmon_url
     hub_url
+    trust_level
   )
 
   USERNAME_RE   = /[a-z0-9_]+([a-z0-9_\.-]+[a-z0-9_]+)?/i
@@ -74,11 +77,6 @@ class Account < ApplicationRecord
   include DomainMaterializable
   include AccountMerging
 
-  TRUST_LEVELS = {
-    untrusted: 0,
-    trusted: 1,
-  }.freeze
-
   enum protocol: [:ostatus, :activitypub]
   enum suspension_origin: [:local, :remote], _prefix: true
 
@@ -202,10 +200,6 @@ class Account < ApplicationRecord
     last_webfingered_at.nil? || last_webfingered_at <= 1.day.ago
   end
 
-  def trust_level
-    self[:trust_level] || 0
-  end
-
   def refresh!
     ResolveAccountService.new.call(acct) unless local?
   end
@@ -388,6 +382,22 @@ class Account < ApplicationRecord
     @synchronization_uri_prefix ||= "#{uri[URL_PREFIX_RE]}/"
   end
 
+  def requires_review?
+    reviewed_at.nil?
+  end
+
+  def reviewed?
+    reviewed_at.present?
+  end
+
+  def requested_review?
+    requested_review_at.present?
+  end
+
+  def requires_review_notification?
+    requires_review? && !requested_review?
+  end
+
   class Field < ActiveModelSerializers::Model
     attributes :name, :value, :verified_at, :account
 
diff --git a/app/models/status.rb b/app/models/status.rb
index 96e41b1d3..adb92ef91 100644
--- a/app/models/status.rb
+++ b/app/models/status.rb
@@ -268,6 +268,18 @@ class Status < ApplicationRecord
     update_status_stat!(key => [public_send(key) - 1, 0].max)
   end
 
+  def trendable?
+    if attributes['trendable'].nil?
+      account.trendable?
+    else
+      attributes['trendable']
+    end
+  end
+
+  def requires_review_notification?
+    attributes['trendable'].nil? && account.requires_review_notification?
+  end
+
   after_create_commit  :increment_counter_caches
   after_destroy_commit :decrement_counter_caches
 
diff --git a/app/models/trends.rb b/app/models/trends.rb
index 7dd3a9c87..f8864e55f 100644
--- a/app/models/trends.rb
+++ b/app/models/trends.rb
@@ -13,15 +13,37 @@ module Trends
     @tags ||= Trends::Tags.new
   end
 
+  def self.statuses
+    @statuses ||= Trends::Statuses.new
+  end
+
+  def self.register!(status)
+    [links, tags, statuses].each { |trend_type| trend_type.register(status) }
+  end
+
   def self.refresh!
-    [links, tags].each(&:refresh)
+    [links, tags, statuses].each(&:refresh)
   end
 
   def self.request_review!
-    [links, tags].each(&:request_review) if enabled?
+    return unless enabled?
+
+    links_requiring_review    = links.request_review
+    tags_requiring_review     = tags.request_review
+    statuses_requiring_review = statuses.request_review
+
+    return if links_requiring_review.empty? && tags_requiring_review.empty? && statuses_requiring_review.empty?
+
+    User.staff.includes(:account).find_each do |user|
+      AdminMailer.new_trends(user.account, links_requiring_review, tags_requiring_review, statuses_requiring_review).deliver_later! if user.allows_trends_review_emails?
+    end
   end
 
   def self.enabled?
     Setting.trends
   end
+
+  def self.available_locales
+    @available_locales ||= I18n.available_locales.map { |locale| locale.to_s.split(/[_-]/).first }.uniq
+  end
 end
diff --git a/app/models/trends/base.rb b/app/models/trends/base.rb
index b767dcb1a..7ed13228d 100644
--- a/app/models/trends/base.rb
+++ b/app/models/trends/base.rb
@@ -2,6 +2,7 @@
 
 class Trends::Base
   include Redisable
+  include LanguagesHelper
 
   class_attribute :default_options
 
@@ -32,8 +33,8 @@ class Trends::Base
     raise NotImplementedError
   end
 
-  def get(*)
-    raise NotImplementedError
+  def query
+    Trends::Query.new(key_prefix, klass)
   end
 
   def score(id)
@@ -72,6 +73,21 @@ class Trends::Base
     redis.zrevrange("#{key_prefix}:allowed", 0, rank, with_scores: true).last&.last || 0
   end
 
+  # @param [Integer] id
+  # @param [Float] score
+  # @param [Hash<String, Boolean>] subsets
+  def add_to_and_remove_from_subsets(id, score, subsets = {})
+    subsets.each_key do |subset|
+      key = [key_prefix, subset].compact.join(':')
+
+      if score.positive? && subsets[subset]
+        redis.zadd(key, score, id)
+      else
+        redis.zrem(key, id)
+      end
+    end
+  end
+
   private
 
   def used_key(at_time)
diff --git a/app/models/trends/links.rb b/app/models/trends/links.rb
index a0d65138b..62308e706 100644
--- a/app/models/trends/links.rb
+++ b/app/models/trends/links.rb
@@ -4,8 +4,8 @@ class Trends::Links < Trends::Base
   PREFIX = 'trending_links'
 
   self.default_options = {
-    threshold: 15,
-    review_threshold: 10,
+    threshold: 5,
+    review_threshold: 3,
     max_score_cooldown: 2.days.freeze,
     max_score_halflife: 8.hours.freeze,
   }
@@ -27,12 +27,6 @@ class Trends::Links < Trends::Base
     record_used_id(preview_card.id, at_time)
   end
 
-  def get(allowed, limit)
-    preview_card_ids = currently_trending_ids(allowed, limit)
-    preview_cards = PreviewCard.where(id: preview_card_ids).index_by(&:id)
-    preview_card_ids.map { |id| preview_cards[id] }.compact
-  end
-
   def refresh(at_time = Time.now.utc)
     preview_cards = PreviewCard.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq)
     calculate_scores(preview_cards, at_time)
@@ -42,7 +36,7 @@ class Trends::Links < Trends::Base
   def request_review
     preview_cards = PreviewCard.where(id: currently_trending_ids(false, -1))
 
-    preview_cards_requiring_review = preview_cards.filter_map do |preview_card|
+    preview_cards.filter_map do |preview_card|
       next unless would_be_trending?(preview_card.id) && !preview_card.trendable? && preview_card.requires_review_notification?
 
       if preview_card.provider.nil?
@@ -53,12 +47,6 @@ class Trends::Links < Trends::Base
 
       preview_card
     end
-
-    return if preview_cards_requiring_review.empty?
-
-    User.staff.includes(:account).find_each do |user|
-      AdminMailer.new_trending_links(user.account, preview_cards_requiring_review).deliver_later! if user.allows_trending_tag_emails?
-    end
   end
 
   protected
@@ -67,6 +55,10 @@ class Trends::Links < Trends::Base
     PREFIX
   end
 
+  def klass
+    PreviewCard
+  end
+
   private
 
   def calculate_scores(preview_cards, at_time)
@@ -96,17 +88,27 @@ class Trends::Links < Trends::Base
 
       decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / options[:max_score_halflife].to_f))
 
-      if decaying_score.zero?
-        redis.zrem("#{PREFIX}:all", preview_card.id)
-        redis.zrem("#{PREFIX}:allowed", preview_card.id)
-      else
-        redis.zadd("#{PREFIX}:all", decaying_score, preview_card.id)
+      add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
+        all: true,
+        allowed: preview_card.trendable?,
+      })
 
-        if preview_card.trendable?
-          redis.zadd("#{PREFIX}:allowed", decaying_score, preview_card.id)
-        else
-          redis.zrem("#{PREFIX}:allowed", preview_card.id)
-        end
+      next unless valid_locale?(preview_card.language)
+
+      add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
+        "all:#{preview_card.language}" => true,
+        "allowed:#{preview_card.language}" => preview_card.trendable?,
+      })
+    end
+
+    # Clean up localized sets by calculating the intersection with the main
+    # set. We do this instead of just deleting the localized sets to avoid
+    # having moments where the API returns empty results
+
+    redis.pipelined do
+      Trends.available_locales.each do |locale|
+        redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
+        redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
       end
     end
   end
diff --git a/app/models/form/preview_card_batch.rb b/app/models/trends/preview_card_batch.rb
similarity index 82%
rename from app/models/form/preview_card_batch.rb
rename to app/models/trends/preview_card_batch.rb
index 5f6e6522a..b1d682910 100644
--- a/app/models/form/preview_card_batch.rb
+++ b/app/models/trends/preview_card_batch.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::PreviewCardBatch
+class Trends::PreviewCardBatch
   include ActiveModel::Model
   include Authorization
 
@@ -10,12 +10,12 @@ class Form::PreviewCardBatch
     case action
     when 'approve'
       approve!
-    when 'approve_all'
-      approve_all!
+    when 'approve_providers'
+      approve_providers!
     when 'reject'
       reject!
-    when 'reject_all'
-      reject_all!
+    when 'reject_providers'
+      reject_providers!
     end
   end
 
@@ -30,13 +30,13 @@ class Form::PreviewCardBatch
   end
 
   def approve!
-    preview_cards.each { |preview_card| authorize(preview_card, :update?) }
+    preview_cards.each { |preview_card| authorize(preview_card, :review?) }
     preview_cards.update_all(trendable: true)
   end
 
-  def approve_all!
+  def approve_providers!
     preview_card_providers.each do |provider|
-      authorize(provider, :update?)
+      authorize(provider, :review?)
       provider.update(trendable: true, reviewed_at: action_time)
     end
 
@@ -45,13 +45,13 @@ class Form::PreviewCardBatch
   end
 
   def reject!
-    preview_cards.each { |preview_card| authorize(preview_card, :update?) }
+    preview_cards.each { |preview_card| authorize(preview_card, :review?) }
     preview_cards.update_all(trendable: false)
   end
 
-  def reject_all!
+  def reject_providers!
     preview_card_providers.each do |provider|
-      authorize(provider, :update?)
+      authorize(provider, :review?)
       provider.update(trendable: false, reviewed_at: action_time)
     end
 
diff --git a/app/models/preview_card_filter.rb b/app/models/trends/preview_card_filter.rb
similarity index 52%
rename from app/models/preview_card_filter.rb
rename to app/models/trends/preview_card_filter.rb
index 8dda9989c..25add58c8 100644
--- a/app/models/preview_card_filter.rb
+++ b/app/models/trends/preview_card_filter.rb
@@ -1,8 +1,9 @@
 # frozen_string_literal: true
 
-class PreviewCardFilter
+class Trends::PreviewCardFilter
   KEYS = %i(
     trending
+    locale
   ).freeze
 
   attr_reader :params
@@ -15,7 +16,7 @@ class PreviewCardFilter
     scope = PreviewCard.unscoped
 
     params.each do |key, value|
-      next if key.to_s == 'page'
+      next if %w(page locale).include?(key.to_s)
 
       scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
     end
@@ -35,19 +36,11 @@ class PreviewCardFilter
   end
 
   def trending_scope(value)
-    ids = begin
-      case value.to_s
-      when 'allowed'
-        Trends.links.currently_trending_ids(true, -1)
-      else
-        Trends.links.currently_trending_ids(false, -1)
-      end
-    end
+    scope = Trends.links.query
 
-    if ids.empty?
-      PreviewCard.none
-    else
-      PreviewCard.joins("join unnest(array[#{ids.map(&:to_i).join(',')}]::integer[]) with ordinality as x (id, ordering) on preview_cards.id = x.id").order('x.ordering')
-    end
+    scope = scope.in_locale(@params[:locale].to_s) if @params[:locale].present?
+    scope = scope.allowed if value == 'allowed'
+
+    scope.to_arel
   end
 end
diff --git a/app/models/form/preview_card_provider_batch.rb b/app/models/trends/preview_card_provider_batch.rb
similarity index 91%
rename from app/models/form/preview_card_provider_batch.rb
rename to app/models/trends/preview_card_provider_batch.rb
index e6ab3d8fa..062720c81 100644
--- a/app/models/form/preview_card_provider_batch.rb
+++ b/app/models/trends/preview_card_provider_batch.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::PreviewCardProviderBatch
+class Trends::PreviewCardProviderBatch
   include ActiveModel::Model
   include Authorization
 
@@ -22,12 +22,12 @@ class Form::PreviewCardProviderBatch
   end
 
   def approve!
-    preview_card_providers.each { |provider| authorize(provider, :update?) }
+    preview_card_providers.each { |provider| authorize(provider, :review?) }
     preview_card_providers.update_all(trendable: true, reviewed_at: Time.now.utc)
   end
 
   def reject!
-    preview_card_providers.each { |provider| authorize(provider, :update?) }
+    preview_card_providers.each { |provider| authorize(provider, :review?) }
     preview_card_providers.update_all(trendable: false, reviewed_at: Time.now.utc)
   end
 end
diff --git a/app/models/preview_card_provider_filter.rb b/app/models/trends/preview_card_provider_filter.rb
similarity index 95%
rename from app/models/preview_card_provider_filter.rb
rename to app/models/trends/preview_card_provider_filter.rb
index 1e90d3c9d..abfdd07e8 100644
--- a/app/models/preview_card_provider_filter.rb
+++ b/app/models/trends/preview_card_provider_filter.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class PreviewCardProviderFilter
+class Trends::PreviewCardProviderFilter
   KEYS = %i(
     status
   ).freeze
diff --git a/app/models/trends/query.rb b/app/models/trends/query.rb
new file mode 100644
index 000000000..64a4c0c1f
--- /dev/null
+++ b/app/models/trends/query.rb
@@ -0,0 +1,106 @@
+# frozen_string_literal: true
+
+class Trends::Query
+  include Redisable
+  include Enumerable
+
+  attr_reader :prefix, :klass, :loaded
+
+  alias loaded? loaded
+
+  def initialize(prefix, klass)
+    @prefix  = prefix
+    @klass   = klass
+    @records = []
+    @loaded  = false
+    @allowed = false
+    @limit   = -1
+    @offset  = 0
+  end
+
+  def allowed!
+    @allowed = true
+    self
+  end
+
+  def allowed
+    clone.allowed!
+  end
+
+  def in_locale!(value)
+    @locale = value
+    self
+  end
+
+  def in_locale(value)
+    clone.in_locale!(value)
+  end
+
+  def offset!(value)
+    @offset = value
+    self
+  end
+
+  def offset(value)
+    clone.offset!(value)
+  end
+
+  def limit!(value)
+    @limit = value
+    self
+  end
+
+  def limit(value)
+    clone.limit!(value)
+  end
+
+  def records
+    load
+    @records
+  end
+
+  delegate :each, :empty?, :first, :last, to: :records
+
+  def to_ary
+    records.dup
+  end
+
+  alias to_a to_ary
+
+  def to_arel
+    tmp_ids = ids
+
+    if tmp_ids.empty?
+      klass.none
+    else
+      klass.joins("join unnest(array[#{tmp_ids.join(',')}]) with ordinality as x (id, ordering) on #{klass.table_name}.id = x.id").reorder('x.ordering')
+    end
+  end
+
+  private
+
+  def key
+    [@prefix, @allowed ? 'allowed' : 'all', @locale].compact.join(':')
+  end
+
+  def load
+    unless loaded?
+      @records = perform_queries
+      @loaded  = true
+    end
+
+    self
+  end
+
+  def ids
+    redis.zrevrange(key, @offset, @limit.positive? ? @limit - 1 : @limit).map(&:to_i)
+  end
+
+  def perform_queries
+    apply_scopes(to_arel).to_a
+  end
+
+  def apply_scopes(scope)
+    scope
+  end
+end
diff --git a/app/models/trends/status_batch.rb b/app/models/trends/status_batch.rb
new file mode 100644
index 000000000..78d93bed4
--- /dev/null
+++ b/app/models/trends/status_batch.rb
@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+
+class Trends::StatusBatch
+  include ActiveModel::Model
+  include Authorization
+
+  attr_accessor :status_ids, :action, :current_account
+
+  def save
+    case action
+    when 'approve'
+      approve!
+    when 'approve_accounts'
+      approve_accounts!
+    when 'reject'
+      reject!
+    when 'reject_accounts'
+      reject_accounts!
+    end
+  end
+
+  private
+
+  def statuses
+    @statuses ||= Status.where(id: status_ids)
+  end
+
+  def status_accounts
+    @status_accounts ||= Account.where(id: statuses.map(&:account_id).uniq)
+  end
+
+  def approve!
+    statuses.each { |status| authorize(status, :review?) }
+    statuses.update_all(trendable: true)
+  end
+
+  def approve_accounts!
+    status_accounts.each do |account|
+      authorize(account, :review?)
+      account.update(trendable: true, reviewed_at: action_time)
+    end
+
+    # Reset any individual overrides
+    statuses.update_all(trendable: nil)
+  end
+
+  def reject!
+    statuses.each { |status| authorize(status, :review?) }
+    statuses.update_all(trendable: false)
+  end
+
+  def reject_accounts!
+    status_accounts.each do |account|
+      authorize(account, :review?)
+      account.update(trendable: false, reviewed_at: action_time)
+    end
+
+    # Reset any individual overrides
+    statuses.update_all(trendable: nil)
+  end
+
+  def action_time
+    @action_time ||= Time.now.utc
+  end
+end
diff --git a/app/models/trends/status_filter.rb b/app/models/trends/status_filter.rb
new file mode 100644
index 000000000..7c453e339
--- /dev/null
+++ b/app/models/trends/status_filter.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+class Trends::StatusFilter
+  KEYS = %i(
+    trending
+    locale
+  ).freeze
+
+  attr_reader :params
+
+  def initialize(params)
+    @params = params
+  end
+
+  def results
+    scope = Status.unscoped.kept
+
+    params.each do |key, value|
+      next if %w(page locale).include?(key.to_s)
+
+      scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
+    end
+
+    scope
+  end
+
+  private
+
+  def scope_for(key, value)
+    case key.to_s
+    when 'trending'
+      trending_scope(value)
+    else
+      raise "Unknown filter: #{key}"
+    end
+  end
+
+  def trending_scope(value)
+    scope = Trends.statuses.query
+
+    scope = scope.in_locale(@params[:locale].to_s) if @params[:locale].present?
+    scope = scope.allowed if value == 'allowed'
+
+    scope.to_arel
+  end
+end
diff --git a/app/models/trends/statuses.rb b/app/models/trends/statuses.rb
new file mode 100644
index 000000000..e785413ec
--- /dev/null
+++ b/app/models/trends/statuses.rb
@@ -0,0 +1,142 @@
+# frozen_string_literal: true
+
+class Trends::Statuses < Trends::Base
+  PREFIX = 'trending_statuses'
+
+  self.default_options = {
+    threshold: 5,
+    review_threshold: 3,
+    score_halflife: 2.hours.freeze,
+  }
+
+  class Query < Trends::Query
+    def filtered_for!(account)
+      @account = account
+      self
+    end
+
+    def filtered_for(account)
+      clone.filtered_for!(account)
+    end
+
+    private
+
+    def apply_scopes(scope)
+      scope.includes(:account)
+    end
+
+    def perform_queries
+      return super if @account.nil?
+
+      statuses        = super
+      account_ids     = statuses.map(&:account_id)
+      account_domains = statuses.map(&:account_domain)
+
+      preloaded_relations = {
+        blocking: Account.blocking_map(account_ids, @account.id),
+        blocked_by: Account.blocked_by_map(account_ids, @account.id),
+        muting: Account.muting_map(account_ids, @account.id),
+        following: Account.following_map(account_ids, @account.id),
+        domain_blocking_by_domain: Account.domain_blocking_map_by_domain(account_domains, @account.id),
+      }
+
+      statuses.reject { |status| StatusFilter.new(status, @account, preloaded_relations).filtered? }
+    end
+  end
+
+  def register(status, at_time = Time.now.utc)
+    add(status.proper, status.account_id, at_time) if eligible?(status)
+  end
+
+  def add(status, _account_id, at_time = Time.now.utc)
+    # We rely on the total reblogs and favourites count, so we
+    # don't record which account did the what and when here
+
+    record_used_id(status.id, at_time)
+  end
+
+  def query
+    Query.new(key_prefix, klass)
+  end
+
+  def refresh(at_time = Time.now.utc)
+    statuses = Status.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq).includes(:account, :media_attachments)
+    calculate_scores(statuses, at_time)
+    trim_older_items
+  end
+
+  def request_review
+    statuses = Status.where(id: currently_trending_ids(false, -1)).includes(:account)
+
+    statuses.filter_map do |status|
+      next unless would_be_trending?(status.id) && !status.trendable? && status.requires_review_notification?
+
+      status.account.touch(:requested_review_at)
+      status
+    end
+  end
+
+  protected
+
+  def key_prefix
+    PREFIX
+  end
+
+  def klass
+    Status
+  end
+
+  private
+
+  def eligible?(status)
+    original_status = status.proper
+
+    original_status.public_visibility? &&
+      original_status.account.discoverable? && !original_status.account.silenced? &&
+      original_status.spoiler_text.blank? && !original_status.sensitive? && !original_status.reply?
+  end
+
+  def calculate_scores(statuses, at_time)
+    redis.pipelined do
+      statuses.each do |status|
+        expected  = 1.0
+        observed  = (status.reblogs_count + status.favourites_count).to_f
+
+        score = begin
+          if expected > observed || observed < options[:threshold]
+            0
+          else
+            ((observed - expected)**2) / expected
+          end
+        end
+
+        decaying_score = score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
+
+        add_to_and_remove_from_subsets(status.id, decaying_score, {
+          all: true,
+          allowed: status.trendable? && status.account.discoverable?,
+        })
+
+        next unless valid_locale?(status.language)
+
+        add_to_and_remove_from_subsets(status.id, decaying_score, {
+          "all:#{status.language}" => true,
+          "allowed:#{status.language}" => status.trendable? && status.account.discoverable?,
+        })
+      end
+
+      # Clean up localized sets by calculating the intersection with the main
+      # set. We do this instead of just deleting the localized sets to avoid
+      # having moments where the API returns empty results
+
+      Trends.available_locales.each do |locale|
+        redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
+        redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
+      end
+    end
+  end
+
+  def would_be_trending?(id)
+    score(id) > score_at_rank(options[:review_threshold] - 1)
+  end
+end
diff --git a/app/models/form/tag_batch.rb b/app/models/trends/tag_batch.rb
similarity index 81%
rename from app/models/form/tag_batch.rb
rename to app/models/trends/tag_batch.rb
index b9330745f..16ee08c06 100644
--- a/app/models/form/tag_batch.rb
+++ b/app/models/trends/tag_batch.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class Form::TagBatch
+class Trends::TagBatch
   include ActiveModel::Model
   include Authorization
 
@@ -22,12 +22,12 @@ class Form::TagBatch
   end
 
   def approve!
-    tags.each { |tag| authorize(tag, :update?) }
+    tags.each { |tag| authorize(tag, :review?) }
     tags.update_all(trendable: true, reviewed_at: action_time)
   end
 
   def reject!
-    tags.each { |tag| authorize(tag, :update?) }
+    tags.each { |tag| authorize(tag, :review?) }
     tags.update_all(trendable: false, reviewed_at: action_time)
   end
 
diff --git a/app/models/tag_filter.rb b/app/models/trends/tag_filter.rb
similarity index 76%
rename from app/models/tag_filter.rb
rename to app/models/trends/tag_filter.rb
index ecdb52503..3b142efc4 100644
--- a/app/models/tag_filter.rb
+++ b/app/models/trends/tag_filter.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class TagFilter
+class Trends::TagFilter
   KEYS = %i(
     trending
     status
@@ -42,13 +42,7 @@ class TagFilter
   end
 
   def trending_scope
-    ids = Trends.tags.currently_trending_ids(false, -1)
-
-    if ids.empty?
-      Tag.none
-    else
-      Tag.joins("join unnest(array[#{ids.map(&:to_i).join(',')}]::integer[]) with ordinality as x (id, ordering) on tags.id = x.id").order('x.ordering')
-    end
+    Trends.tags.query.to_arel
   end
 
   def status_scope(value)
diff --git a/app/models/trends/tags.rb b/app/models/trends/tags.rb
index 2ea4550df..3caa58815 100644
--- a/app/models/trends/tags.rb
+++ b/app/models/trends/tags.rb
@@ -5,7 +5,7 @@ class Trends::Tags < Trends::Base
 
   self.default_options = {
     threshold: 5,
-    review_threshold: 10,
+    review_threshold: 3,
     max_score_cooldown: 2.days.freeze,
     max_score_halflife: 4.hours.freeze,
   }
@@ -29,27 +29,15 @@ class Trends::Tags < Trends::Base
     trim_older_items
   end
 
-  def get(allowed, limit)
-    tag_ids = currently_trending_ids(allowed, limit)
-    tags = Tag.where(id: tag_ids).index_by(&:id)
-    tag_ids.map { |id| tags[id] }.compact
-  end
-
   def request_review
     tags = Tag.where(id: currently_trending_ids(false, -1))
 
-    tags_requiring_review = tags.filter_map do |tag|
+    tags.filter_map do |tag|
       next unless would_be_trending?(tag.id) && !tag.trendable? && tag.requires_review_notification?
 
       tag.touch(:requested_review_at)
       tag
     end
-
-    return if tags_requiring_review.empty?
-
-    User.staff.includes(:account).find_each do |user|
-      AdminMailer.new_trending_tags(user.account, tags_requiring_review).deliver_later! if user.allows_trending_tag_emails?
-    end
   end
 
   protected
@@ -58,6 +46,10 @@ class Trends::Tags < Trends::Base
     PREFIX
   end
 
+  def klass
+    Tag
+  end
+
   private
 
   def calculate_scores(tags, at_time)
@@ -87,18 +79,10 @@ class Trends::Tags < Trends::Base
 
       decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / options[:max_score_halflife].to_f))
 
-      if decaying_score.zero?
-        redis.zrem("#{PREFIX}:all", tag.id)
-        redis.zrem("#{PREFIX}:allowed", tag.id)
-      else
-        redis.zadd("#{PREFIX}:all", decaying_score, tag.id)
-
-        if tag.trendable?
-          redis.zadd("#{PREFIX}:allowed", decaying_score, tag.id)
-        else
-          redis.zrem("#{PREFIX}:allowed", tag.id)
-        end
-      end
+      add_to_and_remove_from_subsets(tag.id, decaying_score, {
+        all: true,
+        allowed: tag.trendable?,
+      })
     end
   end
 
diff --git a/app/models/user.rb b/app/models/user.rb
index 517254a91..bbf850d84 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -269,7 +269,7 @@ class User < ApplicationRecord
     settings.notification_emails['appeal']
   end
 
-  def allows_trending_tag_emails?
+  def allows_trends_review_emails?
     settings.notification_emails['trending_tag']
   end
 
diff --git a/app/policies/account_policy.rb b/app/policies/account_policy.rb
index 46237e45c..cc23771e7 100644
--- a/app/policies/account_policy.rb
+++ b/app/policies/account_policy.rb
@@ -68,4 +68,8 @@ class AccountPolicy < ApplicationPolicy
   def unblock_email?
     staff?
   end
+
+  def review?
+    staff?
+  end
 end
diff --git a/app/policies/preview_card_policy.rb b/app/policies/preview_card_policy.rb
index 4f485d7fc..0410987e4 100644
--- a/app/policies/preview_card_policy.rb
+++ b/app/policies/preview_card_policy.rb
@@ -5,7 +5,7 @@ class PreviewCardPolicy < ApplicationPolicy
     staff?
   end
 
-  def update?
+  def review?
     staff?
   end
 end
diff --git a/app/policies/preview_card_provider_policy.rb b/app/policies/preview_card_provider_policy.rb
index 598d54a5e..44d2ad5cf 100644
--- a/app/policies/preview_card_provider_policy.rb
+++ b/app/policies/preview_card_provider_policy.rb
@@ -5,7 +5,7 @@ class PreviewCardProviderPolicy < ApplicationPolicy
     staff?
   end
 
-  def update?
+  def review?
     staff?
   end
 end
diff --git a/app/policies/status_policy.rb b/app/policies/status_policy.rb
index 6e9b840db..400f1ec79 100644
--- a/app/policies/status_policy.rb
+++ b/app/policies/status_policy.rb
@@ -41,6 +41,10 @@ class StatusPolicy < ApplicationPolicy
     staff? || owned?
   end
 
+  def review?
+    staff?
+  end
+
   private
 
   def requires_mention?
diff --git a/app/policies/tag_policy.rb b/app/policies/tag_policy.rb
index aaf70fcab..bdfcec0c9 100644
--- a/app/policies/tag_policy.rb
+++ b/app/policies/tag_policy.rb
@@ -12,4 +12,8 @@ class TagPolicy < ApplicationPolicy
   def update?
     staff?
   end
+
+  def review?
+    staff?
+  end
 end
diff --git a/app/services/delete_account_service.rb b/app/services/delete_account_service.rb
index a572a7c59..a2d535d26 100644
--- a/app/services/delete_account_service.rb
+++ b/app/services/delete_account_service.rb
@@ -220,21 +220,23 @@ class DeleteAccountService < BaseService
 
     return unless keep_account_record?
 
-    @account.silenced_at       = nil
-    @account.suspended_at      = @options[:suspended_at] || Time.now.utc
-    @account.suspension_origin = :local
-    @account.locked            = false
-    @account.memorial          = false
-    @account.discoverable      = false
-    @account.display_name      = ''
-    @account.note              = ''
-    @account.fields            = []
-    @account.statuses_count    = 0
-    @account.followers_count   = 0
-    @account.following_count   = 0
-    @account.moved_to_account  = nil
-    @account.also_known_as     = []
-    @account.trust_level       = :untrusted
+    @account.silenced_at         = nil
+    @account.suspended_at        = @options[:suspended_at] || Time.now.utc
+    @account.suspension_origin   = :local
+    @account.locked              = false
+    @account.memorial            = false
+    @account.discoverable        = false
+    @account.trendable           = false
+    @account.display_name        = ''
+    @account.note                = ''
+    @account.fields              = []
+    @account.statuses_count      = 0
+    @account.followers_count     = 0
+    @account.following_count     = 0
+    @account.moved_to_account    = nil
+    @account.reviewed_at         = nil
+    @account.requested_review_at = nil
+    @account.also_known_as       = []
     @account.avatar.destroy
     @account.header.destroy
     @account.save!
diff --git a/app/services/favourite_service.rb b/app/services/favourite_service.rb
index a0ab3b4b7..0ca0081b4 100644
--- a/app/services/favourite_service.rb
+++ b/app/services/favourite_service.rb
@@ -17,6 +17,8 @@ class FavouriteService < BaseService
 
     favourite = Favourite.create!(account: account, status: status)
 
+    Trends.statuses.register(status)
+
     create_notification(favourite)
     bump_potential_friendship(account, status)
 
diff --git a/app/services/reblog_service.rb b/app/services/reblog_service.rb
index 2d1265f10..7d2981709 100644
--- a/app/services/reblog_service.rb
+++ b/app/services/reblog_service.rb
@@ -30,8 +30,7 @@ class ReblogService < BaseService
 
     reblog = account.statuses.create!(reblog: reblogged_status, text: '', visibility: visibility, rate_limit: options[:with_rate_limit])
 
-    Trends.tags.register(reblog)
-    Trends.links.register(reblog)
+    Trends.register!(reblog)
     DistributionWorker.perform_async(reblog.id)
     ActivityPub::DistributionWorker.perform_async(reblog.id)
 
diff --git a/app/views/admin/custom_emojis/_custom_emoji.html.haml b/app/views/admin/custom_emojis/_custom_emoji.html.haml
index 526c844e9..41f3975cf 100644
--- a/app/views/admin/custom_emojis/_custom_emoji.html.haml
+++ b/app/views/admin/custom_emojis/_custom_emoji.html.haml
@@ -3,7 +3,7 @@
     = f.check_box :custom_emoji_ids, { multiple: true, include_hidden: false }, custom_emoji.id
   .batch-table__row__content.batch-table__row__content--with-image
     .batch-table__row__content__image
-      = custom_emoji_tag(custom_emoji, animate = current_account&.user&.setting_auto_play_gif)
+      = custom_emoji_tag(custom_emoji, current_account&.user&.setting_auto_play_gif)
 
     .batch-table__row__content__text
       %samp= ":#{custom_emoji.shortcode}:"
diff --git a/app/views/admin/follow_recommendations/show.html.haml b/app/views/admin/follow_recommendations/show.html.haml
index 272681864..ebc4a2c6b 100644
--- a/app/views/admin/follow_recommendations/show.html.haml
+++ b/app/views/admin/follow_recommendations/show.html.haml
@@ -9,12 +9,14 @@
 %hr.spacer/
 
 = form_tag admin_follow_recommendations_path, method: 'GET', class: 'simple_form' do
+  - RelationshipFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
+
   .filters
     .filter-subset.filter-subset--with-select
       %strong= t('admin.follow_recommendations.language')
       .input.select.optional
-        = select_tag :language, options_for_select(I18n.available_locales.map { |key| key.to_s.split(/[_-]/).first.to_sym }.uniq.map { |key| [standard_locale_name(key), key]}, @language)
-
+        = select_tag :language, options_for_select(Trends.available_locales.map { |key| [standard_locale_name(key), key] }, @language)
     .filter-subset
       %strong= t('admin.follow_recommendations.status')
       %ul
diff --git a/app/views/admin/trends/links/index.html.haml b/app/views/admin/trends/links/index.html.haml
index 240ae722b..79f3513d3 100644
--- a/app/views/admin/trends/links/index.html.haml
+++ b/app/views/admin/trends/links/index.html.haml
@@ -4,23 +4,29 @@
 - content_for :header_tags do
   = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
 
-.filters
-  .filter-subset
-    %strong= t('admin.trends.trending')
-    %ul
-      %li= filter_link_to t('generic.all'), trending: nil
-      %li= filter_link_to t('admin.trends.only_allowed'), trending: 'allowed'
-  .back-link
-    = link_to admin_trends_links_preview_card_providers_path do
-      = t('admin.trends.preview_card_providers.title')
-      = fa_icon 'chevron-right fw'
+= form_tag admin_trends_links_path, method: 'GET', class: 'simple_form' do
+  - Trends::PreviewCardFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
 
-%hr.spacer/
+  .filters
+    .filter-subset.filter-subset--with-select
+      %strong= t('admin.follow_recommendations.language')
+      .input.select.optional
+        = select_tag :locale, options_for_select(Trends.available_locales.map { |key| [standard_locale_name(key), key] }, params[:locale]), include_blank: true
+    .filter-subset
+      %strong= t('admin.trends.trending')
+      %ul
+        %li= filter_link_to t('generic.all'), trending: nil
+        %li= filter_link_to t('admin.trends.only_allowed'), trending: 'allowed'
+    .back-link
+      = link_to admin_trends_links_preview_card_providers_path do
+        = t('admin.trends.preview_card_providers.title')
+        = fa_icon 'chevron-right fw'
 
 = form_for(@form, url: batch_admin_trends_links_path) do |f|
   = hidden_field_tag :page, params[:page] || 1
 
-  - PreviewCardFilter::KEYS.each do |key|
+  - Trends::PreviewCardFilter::KEYS.each do |key|
     = hidden_field_tag key, params[key] if params[key].present?
 
   .batch-table
@@ -29,9 +35,9 @@
         = check_box_tag :batch_checkbox_all, nil, false
       .batch-table__toolbar__actions
         = f.button safe_join([fa_icon('check'), t('admin.trends.links.allow')]), name: :approve, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
-        = f.button safe_join([fa_icon('check'), t('admin.trends.links.allow_provider')]), name: :approve_all, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('check'), t('admin.trends.links.allow_provider')]), name: :approve_providers, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
         = f.button safe_join([fa_icon('times'), t('admin.trends.links.disallow')]), name: :reject, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
-        = f.button safe_join([fa_icon('times'), t('admin.trends.links.disallow_provider')]), name: :reject_all, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('times'), t('admin.trends.links.disallow_provider')]), name: :reject_providers, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
     .batch-table__body
       - if @preview_cards.empty?
         = nothing_here 'nothing-here--under-tabs'
diff --git a/app/views/admin/trends/links/preview_card_providers/index.html.haml b/app/views/admin/trends/links/preview_card_providers/index.html.haml
index eac6e641f..b79349947 100644
--- a/app/views/admin/trends/links/preview_card_providers/index.html.haml
+++ b/app/views/admin/trends/links/preview_card_providers/index.html.haml
@@ -23,7 +23,7 @@
 = form_for(@form, url: batch_admin_trends_links_preview_card_providers_path) do |f|
   = hidden_field_tag :page, params[:page] || 1
 
-  - PreviewCardProviderFilter::KEYS.each do |key|
+  - Trends::PreviewCardProviderFilter::KEYS.each do |key|
     = hidden_field_tag key, params[key] if params[key].present?
 
   .batch-table.optional
diff --git a/app/views/admin/trends/statuses/_status.html.haml b/app/views/admin/trends/statuses/_status.html.haml
new file mode 100644
index 000000000..c99ee5d60
--- /dev/null
+++ b/app/views/admin/trends/statuses/_status.html.haml
@@ -0,0 +1,30 @@
+.batch-table__row{ class: [status.account.requires_review? && 'batch-table__row--attention', !status.account.requires_review? && !status.trendable? && 'batch-table__row--muted'] }
+  %label.batch-table__row__select.batch-table__row__select--aligned.batch-checkbox
+    = f.check_box :status_ids, { multiple: true, include_hidden: false }, status.id
+
+  .batch-table__row__content.pending-account__header
+    .one-liner
+      = admin_account_link_to status.account
+
+      = link_to ActivityPub::TagManager.instance.url_for(status), target: '_blank', class: 'emojify', rel: 'noopener noreferrer' do
+        = one_line_preview(status)
+
+        - status.media_attachments.each do |media_attachment|
+          %abbr{ title: media_attachment.description }
+            = fa_icon 'link'
+            = media_attachment.file_file_name
+
+    = t('admin.trends.statuses.shared_by', count: status.reblogs_count + status.favourites_count, friendly_count: friendly_number_to_human(status.reblogs_count + status.favourites_count))
+
+    - if status.account.domain.present?
+      •
+      = status.account.domain
+    - if status.language.present?
+      •
+      = standard_locale_name(status.language)
+    - if status.trendable? && (rank = Trends.statuses.rank(status.id))
+      •
+      %abbr{ title: t('admin.trends.tags.current_score', score: Trends.statuses.score(status.id)) }= t('admin.trends.tags.trending_rank', rank: rank + 1)
+    - elsif status.account.requires_review?
+      •
+      = t('admin.trends.pending_review')
diff --git a/app/views/admin/trends/statuses/index.html.haml b/app/views/admin/trends/statuses/index.html.haml
new file mode 100644
index 000000000..347688262
--- /dev/null
+++ b/app/views/admin/trends/statuses/index.html.haml
@@ -0,0 +1,43 @@
+- content_for :page_title do
+  = t('admin.trends.statuses.title')
+
+- content_for :header_tags do
+  = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
+
+= form_tag admin_trends_statuses_path, method: 'GET', class: 'simple_form' do
+  - Trends::StatusFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
+
+  .filters
+    .filter-subset.filter-subset--with-select
+      %strong= t('admin.follow_recommendations.language')
+      .input.select.optional
+        = select_tag :locale, options_for_select(Trends.available_locales.map { |key| [standard_locale_name(key), key]}, params[:locale]), include_blank: true
+    .filter-subset
+      %strong= t('admin.trends.trending')
+      %ul
+        %li= filter_link_to t('generic.all'), trending: nil
+        %li= filter_link_to t('admin.trends.only_allowed'), trending: 'allowed'
+
+= form_for(@form, url: batch_admin_trends_statuses_path) do |f|
+  = hidden_field_tag :page, params[:page] || 1
+
+  - Trends::StatusFilter::KEYS.each do |key|
+    = hidden_field_tag key, params[key] if params[key].present?
+
+  .batch-table
+    .batch-table__toolbar
+      %label.batch-table__toolbar__select.batch-checkbox-all
+        = check_box_tag :batch_checkbox_all, nil, false
+      .batch-table__toolbar__actions
+        = f.button safe_join([fa_icon('check'), t('admin.trends.statuses.allow')]), name: :approve, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('check'), t('admin.trends.statuses.allow_account')]), name: :approve_accounts, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('times'), t('admin.trends.statuses.disallow')]), name: :reject, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+        = f.button safe_join([fa_icon('times'), t('admin.trends.statuses.disallow_account')]), name: :reject_accounts, class: 'table-action-link', type: :submit, data: { confirm: t('admin.reports.are_you_sure') }
+    .batch-table__body
+      - if @statuses.empty?
+        = nothing_here 'nothing-here--under-tabs'
+      - else
+        = render partial: 'status', collection: @statuses, locals: { f: f }
+
+= paginate @statuses
diff --git a/app/views/admin/trends/tags/index.html.haml b/app/views/admin/trends/tags/index.html.haml
index 8df0a9920..8a2f785bc 100644
--- a/app/views/admin/trends/tags/index.html.haml
+++ b/app/views/admin/trends/tags/index.html.haml
@@ -13,12 +13,10 @@
       %li= filter_link_to t('admin.trends.rejected'), status: 'rejected'
       %li= filter_link_to safe_join([t('admin.accounts.moderation.pending'), "(#{Tag.pending_review.count})"], ' '), status: 'pending_review'
 
-%hr.spacer/
-
 = form_for(@form, url: batch_admin_trends_tags_path) do |f|
   = hidden_field_tag :page, params[:page] || 1
 
-  - TagFilter::KEYS.each do |key|
+  - Trends::TagFilter::KEYS.each do |key|
     = hidden_field_tag key, params[key] if params[key].present?
 
   .batch-table.optional
diff --git a/app/views/admin_mailer/_new_trending_links.text.erb b/app/views/admin_mailer/_new_trending_links.text.erb
new file mode 100644
index 000000000..405926fdd
--- /dev/null
+++ b/app/views/admin_mailer/_new_trending_links.text.erb
@@ -0,0 +1,14 @@
+<%= raw t('admin_mailer.new_trends.new_trending_links.title') %>
+
+<% @links.each do |link| %>
+- <%= link.title %> • <%= link.url %>
+  <%= raw t('admin.trends.links.usage_comparison', today: link.history.get(Time.now.utc).accounts, yesterday: link.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.links.score(link.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_link %>
+<%= raw t('admin_mailer.new_trends.new_trending_links.requirements', lowest_link_title: @lowest_trending_link.title, lowest_link_score: Trends.links.score(@lowest_trending_link.id).round(2), rank: Trends.links.options[:review_threshold]) %>
+<% else %>
+<%= raw t('admin_mailer.new_trends.new_trending_links.no_approved_links') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_links_url %>
diff --git a/app/views/admin_mailer/_new_trending_statuses.text.erb b/app/views/admin_mailer/_new_trending_statuses.text.erb
new file mode 100644
index 000000000..8d11a80c2
--- /dev/null
+++ b/app/views/admin_mailer/_new_trending_statuses.text.erb
@@ -0,0 +1,14 @@
+<%= raw t('admin_mailer.new_trends.new_trending_statuses.title') %>
+
+<% @statuses.each do |status| %>
+- <%= ActivityPub::TagManager.instance.url_for(status) %>
+  <%= raw t('admin.trends.tags.current_score', score: Trends.statuses.score(status.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_status %>
+<%= raw t('admin_mailer.new_trends.new_trending_statuses.requirements', lowest_status_url: ActivityPub::TagManager.instance.url_for(@lowest_trending_status), lowest_status_score: Trends.statuses.score(@lowest_trending_status.id).round(2), rank: Trends.statuses.options[:review_threshold]) %>
+<% else %>
+<%= raw t('admin_mailer.new_trends.new_trending_statuses.no_approved_statuses') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_statuses_url %>
diff --git a/app/views/admin_mailer/_new_trending_tags.text.erb b/app/views/admin_mailer/_new_trending_tags.text.erb
new file mode 100644
index 000000000..49fe84309
--- /dev/null
+++ b/app/views/admin_mailer/_new_trending_tags.text.erb
@@ -0,0 +1,14 @@
+<%= raw t('admin_mailer.new_trends.new_trending_tags.title') %>
+
+<% @tags.each do |tag| %>
+- #<%= tag.name %>
+  <%= raw t('admin.trends.tags.usage_comparison', today: tag.history.get(Time.now.utc).accounts, yesterday: tag.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.tags.score(tag.id).round(2)) %>
+<% end %>
+
+<% if @lowest_trending_tag %>
+<%= raw t('admin_mailer.new_trends.new_trending_tags.requirements', lowest_tag_name: @lowest_trending_tag.name, lowest_tag_score: Trends.tags.score(@lowest_trending_tag.id).round(2), rank: Trends.tags.options[:review_threshold]) %>
+<% else %>
+<%= raw t('admin_mailer.new_trends.new_trending_tags.no_approved_tags') %>
+<% end %>
+
+<%= raw t('application_mailer.view')%> <%= admin_trends_tags_url(pending_review: '1') %>
diff --git a/app/views/admin_mailer/new_trending_links.text.erb b/app/views/admin_mailer/new_trending_links.text.erb
deleted file mode 100644
index 51789aca5..000000000
--- a/app/views/admin_mailer/new_trending_links.text.erb
+++ /dev/null
@@ -1,16 +0,0 @@
-<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
-
-<%= raw t('admin_mailer.new_trending_links.body') %>
-
-<% @links.each do |link| %>
-- <%= link.title %> • <%= link.url %>
-  <%= t('admin.trends.links.usage_comparison', today: link.history.get(Time.now.utc).accounts, yesterday: link.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.links.score(link.id).round(2)) %>
-<% end %>
-
-<% if @lowest_trending_link %>
-<%= t('admin_mailer.new_trending_links.requirements', lowest_link_title: @lowest_trending_link.title, lowest_link_score: Trends.links.score(@lowest_trending_link.id).round(2)) %>
-<% else %>
-<%= t('admin_mailer.new_trending_links.no_approved_links') %>
-<% end %>
-
-<%= raw t('application_mailer.view')%> <%= admin_trends_links_url %>
diff --git a/app/views/admin_mailer/new_trending_tags.text.erb b/app/views/admin_mailer/new_trending_tags.text.erb
deleted file mode 100644
index 9ea31fa7c..000000000
--- a/app/views/admin_mailer/new_trending_tags.text.erb
+++ /dev/null
@@ -1,16 +0,0 @@
-<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
-
-<%= raw t('admin_mailer.new_trending_tags.body') %>
-
-<% @tags.each do |tag| %>
-- #<%= tag.name %>
-  <%= t('admin.trends.tags.usage_comparison', today: tag.history.get(Time.now.utc).accounts, yesterday: tag.history.get(Time.now.utc - 1.day).accounts) %> • <%= t('admin.trends.tags.current_score', score: Trends.tags.score(tag.id).round(2)) %>
-<% end %>
-
-<% if @lowest_trending_tag %>
-<%= t('admin_mailer.new_trending_tags.requirements', lowest_tag_name: @lowest_trending_tag.name, lowest_tag_score: Trends.tags.score(@lowest_trending_tag.id).round(2)) %>
-<% else %>
-<%= t('admin_mailer.new_trending_tags.no_approved_tags') %>
-<% end %>
-
-<%= raw t('application_mailer.view')%> <%= admin_trends_tags_url(status: 'pending_review') %>
diff --git a/app/views/admin_mailer/new_trends.text.erb b/app/views/admin_mailer/new_trends.text.erb
new file mode 100644
index 000000000..13b296846
--- /dev/null
+++ b/app/views/admin_mailer/new_trends.text.erb
@@ -0,0 +1,13 @@
+<%= raw t('application_mailer.salutation', name: display_name(@me)) %>
+
+<%= raw t('admin_mailer.new_trends.body') %>
+
+<% unless @links.empty? %>
+<%= render 'new_trending_links' %>
+<% end %>
+<% unless @tags.empty? %>
+<%= render 'new_trending_tags' unless @tags.empty? %>
+<% end %>
+<% unless @statuses.empty? %>
+<%= render 'new_trending_statuses' unless @statuses.empty? %>
+<% end %>
diff --git a/app/views/application/_sidebar.html.haml b/app/views/application/_sidebar.html.haml
index 6826c3b58..e97c493fe 100644
--- a/app/views/application/_sidebar.html.haml
+++ b/app/views/application/_sidebar.html.haml
@@ -6,7 +6,7 @@
     %p= @instance_presenter.site_short_description.html_safe.presence || t('about.about_mastodon_html')
 
 - if Setting.trends && !(user_signed_in? && !current_user.setting_trends)
-  - trends = Trends.tags.get(true, 3)
+  - trends = Trends.tags.query.allowed.limit(3)
 
   - unless trends.empty?
     .endorsements-widget.trends-widget
diff --git a/app/workers/scheduler/follow_recommendations_scheduler.rb b/app/workers/scheduler/follow_recommendations_scheduler.rb
index 084619cbd..57f78170e 100644
--- a/app/workers/scheduler/follow_recommendations_scheduler.rb
+++ b/app/workers/scheduler/follow_recommendations_scheduler.rb
@@ -18,7 +18,7 @@ class Scheduler::FollowRecommendationsScheduler
 
     fallback_recommendations = FollowRecommendation.order(rank: :desc).limit(SET_SIZE)
 
-    I18n.available_locales.map { |locale| locale.to_s.split(/[_-]/).first }.uniq.each do |locale|
+    Trends.available_locales.each do |locale|
       recommendations = begin
         if AccountSummary.safe.filtered.localized(locale).exists? # We can skip the work if no accounts with that language exist
           FollowRecommendation.localized(locale).order(rank: :desc).limit(SET_SIZE).map { |recommendation| [recommendation.account_id, recommendation.rank] }
@@ -49,11 +49,11 @@ class Scheduler::FollowRecommendationsScheduler
         end
       end
 
-      redis.pipelined do
-        redis.del(key(locale))
+      redis.multi do |multi|
+        multi.del(key(locale))
 
         recommendations.each do |(account_id, rank)|
-          redis.zadd(key(locale), rank, account_id)
+          multi.zadd(key(locale), rank, account_id)
         end
       end
     end
diff --git a/config/brakeman.ignore b/config/brakeman.ignore
index 6ffe12ae0..c24146da4 100644
--- a/config/brakeman.ignore
+++ b/config/brakeman.ignore
@@ -7,7 +7,7 @@
       "check_name": "SQL",
       "message": "Possible SQL injection",
       "file": "app/models/status.rb",
-      "line": 104,
+      "line": 105,
       "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
       "code": "result.joins(\"INNER JOIN statuses_tags t#{id} ON t#{id}.status_id = statuses.id AND t#{id}.tag_id = #{id}\")",
       "render_path": null,
@@ -20,6 +20,26 @@
       "confidence": "Weak",
       "note": ""
     },
+    {
+      "warning_type": "SQL Injection",
+      "warning_code": 0,
+      "fingerprint": "30dfe36e87fe1b8f239df9a33d576e44a9863f73b680198d4713be6540ae61d3",
+      "check_name": "SQL",
+      "message": "Possible SQL injection",
+      "file": "app/models/trends/query.rb",
+      "line": 60,
+      "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
+      "code": "klass.joins(\"join unnest(array[#{ids.join(\",\")}]) with ordinality as x (id, ordering) on #{klass.table_name}.id = x.id\")",
+      "render_path": null,
+      "location": {
+        "type": "method",
+        "class": "Trends::Query",
+        "method": "to_arel"
+      },
+      "user_input": "ids.join(\",\")",
+      "confidence": "Weak",
+      "note": ""
+    },
     {
       "warning_type": "Redirect",
       "warning_code": 18,
@@ -100,26 +120,6 @@
       "confidence": "High",
       "note": ""
     },
-    {
-      "warning_type": "SQL Injection",
-      "warning_code": 0,
-      "fingerprint": "8c1d8c4b76c1cd3960e90dff999f854a6ff742fcfd8de6c7184ac5a1b1a4d7dd",
-      "check_name": "SQL",
-      "message": "Possible SQL injection",
-      "file": "app/models/preview_card_filter.rb",
-      "line": 50,
-      "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
-      "code": "PreviewCard.joins(\"join unnest(array[#{(Trends.links.currently_trending_ids(true, -1) or Trends.links.currently_trending_ids(false, -1)).map(&:to_i).join(\",\")}]::integer[]) with ordinality as x (id, ordering) on preview_cards.id = x.id\")",
-      "render_path": null,
-      "location": {
-        "type": "method",
-        "class": "PreviewCardFilter",
-        "method": "trending_scope"
-      },
-      "user_input": "(Trends.links.currently_trending_ids(true, -1) or Trends.links.currently_trending_ids(false, -1)).map(&:to_i).join(\",\")",
-      "confidence": "Medium",
-      "note": ""
-    },
     {
       "warning_type": "Cross-Site Scripting",
       "warning_code": 2,
@@ -134,7 +134,7 @@
         {
           "type": "template",
           "name": "admin/disputes/appeals/index",
-          "line": 16,
+          "line": 20,
           "file": "app/views/admin/disputes/appeals/index.html.haml",
           "rendered": {
             "name": "admin/disputes/appeals/_appeal",
@@ -170,26 +170,6 @@
       "confidence": "High",
       "note": ""
     },
-    {
-      "warning_type": "SQL Injection",
-      "warning_code": 0,
-      "fingerprint": "c32a484ccd9da46abd3bc93d08b72029d7dbc0576ccf4e878a9627e9a83cad2e",
-      "check_name": "SQL",
-      "message": "Possible SQL injection",
-      "file": "app/models/tag_filter.rb",
-      "line": 50,
-      "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
-      "code": "Tag.joins(\"join unnest(array[#{Trends.tags.currently_trending_ids(false, -1).map(&:to_i).join(\",\")}]::integer[]) with ordinality as x (id, ordering) on tags.id = x.id\")",
-      "render_path": null,
-      "location": {
-        "type": "method",
-        "class": "TagFilter",
-        "method": "trending_scope"
-      },
-      "user_input": "Trends.tags.currently_trending_ids(false, -1).map(&:to_i).join(\",\")",
-      "confidence": "Medium",
-      "note": ""
-    },
     {
       "warning_type": "Cross-Site Scripting",
       "warning_code": 4,
@@ -204,7 +184,7 @@
         {
           "type": "template",
           "name": "admin/trends/links/index",
-          "line": 39,
+          "line": 45,
           "file": "app/views/admin/trends/links/index.html.haml",
           "rendered": {
             "name": "admin/trends/links/_preview_card",
@@ -241,6 +221,6 @@
       "note": ""
     }
   ],
-  "updated": "2022-02-13 02:24:12 +0100",
+  "updated": "2022-02-15 03:48:53 +0100",
   "brakeman_version": "5.2.1"
 }
diff --git a/config/locales/en.yml b/config/locales/en.yml
index f045174a9..60c291540 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -787,6 +787,15 @@ en:
         rejected: Links from this publisher won't trend
         title: Publishers
       rejected: Rejected
+      statuses:
+        allow: Allow post
+        allow_account: Allow author
+        disallow: Disallow post
+        disallow_account: Disallow author
+        shared_by:
+          one: Shared or favourited one time
+          other: Shared and favourited %{friendly_count} times
+        title: Trending posts
       tags:
         current_score: Current score %{score}
         dashboard:
@@ -835,16 +844,21 @@ en:
       body: "%{reporter} has reported %{target}"
       body_remote: Someone from %{domain} has reported %{target}
       subject: New report for %{instance} (#%{id})
-    new_trending_links:
-      body: The following links are trending today, but their publishers have not been previously reviewed. They will not be displayed publicly unless you approve them. Further notifications from the same publishers will not be generated.
-      no_approved_links: There are currently no approved trending links.
-      requirements: The lowest approved trending link is currently "%{lowest_link_title}" with a score of %{lowest_link_score}.
-      subject: New trending links up for review on %{instance}
-    new_trending_tags:
-      body: 'The following hashtags are trending today, but they have not been previously reviewed. They will not be displayed publicly unless you approve them:'
-      no_approved_tags: There are currently no approved trending hashtags.
-      requirements: 'The lowest approved trending hashtag is currently #%{lowest_tag_name} with a score of %{lowest_tag_score}.'
-      subject: New trending hashtags up for review on %{instance}
+    new_trends:
+      body: 'The following items need a review before they can be displayed publicly:'
+      new_trending_links:
+        no_approved_links: There are currently no approved trending links.
+        requirements: 'Any of these candidates could surpass the #%{rank} approved trending link, which is currently "%{lowest_link_title}" with a score of %{lowest_link_score}.'
+        title: Trending links
+      new_trending_statuses:
+        no_approved_statuses: There are currently no approved trending posts.
+        requirements: 'Any of these candidates could surpass the #%{rank} approved trending post, which is currently %{lowest_status_url} with a score of %{lowest_status_score}.'
+        title: Trending posts
+      new_trending_tags:
+        no_approved_tags: There are currently no approved trending hashtags.
+        requirements: 'Any of these candidates could surpass the #%{rank} approved trending hashtag, which is currently #%{lowest_tag_name} with a score of %{lowest_tag_score}.'
+        title: Trending hashtags
+      subject: New trends up for review on %{instance}
   aliases:
     add_new: Create alias
     created_msg: Successfully created a new alias. You can now initiate the move from the old account.
diff --git a/config/navigation.rb b/config/navigation.rb
index 3fc3747d5..620f78c57 100644
--- a/config/navigation.rb
+++ b/config/navigation.rb
@@ -34,6 +34,7 @@ SimpleNavigation::Configuration.run do |navigation|
     n.item :development, safe_join([fa_icon('code fw'), t('settings.development')]), settings_applications_url, if: -> { current_user.functional? }
 
     n.item :trends, safe_join([fa_icon('fire fw'), t('admin.trends.title')]), admin_trends_tags_path, if: proc { current_user.staff? } do |s|
+      s.item :statuses, safe_join([fa_icon('comments-o fw'), t('admin.trends.statuses.title')]), admin_trends_statuses_path, highlights_on: %r{/admin/trends/statuses}
       s.item :tags, safe_join([fa_icon('hashtag fw'), t('admin.trends.tags.title')]), admin_trends_tags_path, highlights_on: %r{/admin/tags|/admin/trends/tags}
       s.item :links, safe_join([fa_icon('newspaper-o fw'), t('admin.trends.links.title')]), admin_trends_links_path, highlights_on: %r{/admin/trends/links}
     end
diff --git a/config/routes.rb b/config/routes.rb
index 176438e45..a820f32ad 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -327,6 +327,12 @@ Rails.application.routes.draw do
         end
       end
 
+      resources :statuses, only: [:index] do
+        collection do
+          post :batch
+        end
+      end
+
       namespace :links do
         resources :preview_card_providers, only: [:index], path: :publishers do
           collection do
@@ -448,6 +454,7 @@ Rails.application.routes.draw do
       namespace :trends do
         resources :links, only: [:index]
         resources :tags, only: [:index]
+        resources :statuses, only: [:index]
       end
 
       namespace :emails do
@@ -554,6 +561,8 @@ Rails.application.routes.draw do
 
         namespace :trends do
           resources :tags, only: [:index]
+          resources :links, only: [:index]
+          resources :statuses, only: [:index]
         end
 
         post :measures, to: 'measures#create'
diff --git a/db/migrate/20220202200743_add_trendable_to_accounts.rb b/db/migrate/20220202200743_add_trendable_to_accounts.rb
new file mode 100644
index 000000000..414df5108
--- /dev/null
+++ b/db/migrate/20220202200743_add_trendable_to_accounts.rb
@@ -0,0 +1,7 @@
+class AddTrendableToAccounts < ActiveRecord::Migration[6.1]
+  def change
+    add_column :accounts, :trendable, :boolean
+    add_column :accounts, :reviewed_at, :datetime
+    add_column :accounts, :requested_review_at, :datetime
+  end
+end
diff --git a/db/migrate/20220202200926_add_trendable_to_statuses.rb b/db/migrate/20220202200926_add_trendable_to_statuses.rb
new file mode 100644
index 000000000..7f38c8ca7
--- /dev/null
+++ b/db/migrate/20220202200926_add_trendable_to_statuses.rb
@@ -0,0 +1,5 @@
+class AddTrendableToStatuses < ActiveRecord::Migration[6.1]
+  def change
+    add_column :statuses, :trendable, :boolean
+  end
+end
diff --git a/db/post_migrate/20220202201015_remove_trust_level_from_accounts.rb b/db/post_migrate/20220202201015_remove_trust_level_from_accounts.rb
new file mode 100644
index 000000000..d5d995ece
--- /dev/null
+++ b/db/post_migrate/20220202201015_remove_trust_level_from_accounts.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class RemoveTrustLevelFromAccounts < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    safety_assured { remove_column :accounts, :trust_level, :integer }
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 0e9b6e619..e54de5b37 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -177,13 +177,15 @@ ActiveRecord::Schema.define(version: 2022_02_24_010024) do
     t.string "also_known_as", array: true
     t.datetime "silenced_at"
     t.datetime "suspended_at"
-    t.integer "trust_level"
     t.boolean "hide_collections"
     t.integer "avatar_storage_schema_version"
     t.integer "header_storage_schema_version"
     t.string "devices_url"
     t.integer "suspension_origin"
     t.datetime "sensitized_at"
+    t.boolean "trendable"
+    t.datetime "reviewed_at"
+    t.datetime "requested_review_at"
     t.index "(((setweight(to_tsvector('simple'::regconfig, (display_name)::text), 'A'::\"char\") || setweight(to_tsvector('simple'::regconfig, (username)::text), 'B'::\"char\")) || setweight(to_tsvector('simple'::regconfig, (COALESCE(domain, ''::character varying))::text), 'C'::\"char\")))", name: "search_index", using: :gin
     t.index "lower((username)::text), COALESCE(lower((domain)::text), ''::text)", name: "index_accounts_on_username_and_domain_lower", unique: true
     t.index ["moved_to_account_id"], name: "index_accounts_on_moved_to_account_id"
@@ -887,6 +889,7 @@ ActiveRecord::Schema.define(version: 2022_02_24_010024) do
     t.bigint "poll_id"
     t.datetime "deleted_at"
     t.datetime "edited_at"
+    t.boolean "trendable"
     t.index ["account_id", "id", "visibility", "updated_at"], name: "index_statuses_20190820", order: { id: :desc }, where: "(deleted_at IS NULL)"
     t.index ["deleted_at"], name: "index_statuses_on_deleted_at", where: "(deleted_at IS NOT NULL)"
     t.index ["id", "account_id"], name: "index_statuses_local_20190824", order: { id: :desc }, where: "((local OR (uri IS NULL)) AND (deleted_at IS NULL) AND (visibility = 0) AND (reblog_of_id IS NULL) AND ((NOT reply) OR (in_reply_to_account_id = account_id)))"
@@ -1228,5 +1231,4 @@ ActiveRecord::Schema.define(version: 2022_02_24_010024) do
     ORDER BY (sum(t0.rank)) DESC;
   SQL
   add_index "follow_recommendations", ["account_id"], name: "index_follow_recommendations_on_account_id", unique: true
-
 end
diff --git a/spec/controllers/api/v1/trends/tags_controller_spec.rb b/spec/controllers/api/v1/trends/tags_controller_spec.rb
index e2e26dcab..d29551c56 100644
--- a/spec/controllers/api/v1/trends/tags_controller_spec.rb
+++ b/spec/controllers/api/v1/trends/tags_controller_spec.rb
@@ -7,10 +7,9 @@ RSpec.describe Api::V1::Trends::TagsController, type: :controller do
 
   describe 'GET #index' do
     before do
-      trending_tags = double()
-
-      allow(trending_tags).to receive(:get).and_return(Fabricate.times(10, :tag))
-      allow(Trends).to receive(:tags).and_return(trending_tags)
+      Fabricate.times(10, :tag).each do |tag|
+        10.times { |i| Trends.tags.add(tag, i) }
+      end
 
       get :index
     end
diff --git a/spec/mailers/previews/admin_mailer_preview.rb b/spec/mailers/previews/admin_mailer_preview.rb
index 9c0372b47..01436ba7a 100644
--- a/spec/mailers/previews/admin_mailer_preview.rb
+++ b/spec/mailers/previews/admin_mailer_preview.rb
@@ -6,14 +6,9 @@ class AdminMailerPreview < ActionMailer::Preview
     AdminMailer.new_pending_account(Account.first, User.pending.first)
   end
 
-  # Preview this email at http://localhost:3000/rails/mailers/admin_mailer/new_trending_tags
-  def new_trending_tags
-    AdminMailer.new_trending_tags(Account.first, Tag.limit(3))
-  end
-
-  # Preview this email at http://localhost:3000/rails/mailers/admin_mailer/new_trending_links
-  def new_trending_links
-    AdminMailer.new_trending_links(Account.first, PreviewCard.limit(3))
+  # Preview this email at http://localhost:3000/rails/mailers/admin_mailer/new_trends
+  def new_trends
+    AdminMailer.new_trends(Account.first, PreviewCard.limit(3), Tag.limit(3), Status.where(reblog_of_id: nil).limit(3))
   end
 
   # Preview this email at http://localhost:3000/rails/mailers/admin_mailer/new_appeal
diff --git a/spec/models/trends/statuses_spec.rb b/spec/models/trends/statuses_spec.rb
new file mode 100644
index 000000000..9cc67acbe
--- /dev/null
+++ b/spec/models/trends/statuses_spec.rb
@@ -0,0 +1,110 @@
+require 'rails_helper'
+
+RSpec.describe Trends::Statuses do
+  subject! { described_class.new(threshold: 5, review_threshold: 10, score_halflife: 8.hours) }
+
+  let!(:at_time) { DateTime.new(2021, 11, 14, 10, 15, 0) }
+
+  describe 'Trends::Statuses::Query' do
+    let!(:query) { subject.query }
+    let!(:today) { at_time }
+
+    let!(:status1) { Fabricate(:status, text: 'Foo', trendable: true, created_at: today) }
+    let!(:status2) { Fabricate(:status, text: 'Bar', trendable: true, created_at: today) }
+
+    before do
+      15.times { reblog(status1, today) }
+      12.times { reblog(status2, today) }
+
+      subject.refresh(today)
+    end
+
+    describe '#filtered_for' do
+      let(:account) { Fabricate(:account) }
+
+      it 'returns a composable query scope' do
+        expect(query.filtered_for(account)).to be_a Trends::Query
+      end
+
+      it 'filters out blocked accounts' do
+        account.block!(status1.account)
+        expect(query.filtered_for(account).to_a).to eq [status2]
+      end
+
+      it 'filters out muted accounts' do
+        account.mute!(status2.account)
+        expect(query.filtered_for(account).to_a).to eq [status1]
+      end
+
+      it 'filters out blocked-by accounts' do
+        status1.account.block!(account)
+        expect(query.filtered_for(account).to_a).to eq [status2]
+      end
+    end
+  end
+
+  describe '#add' do
+    let(:status) { Fabricate(:status) }
+
+    before do
+      subject.add(status, 1, at_time)
+    end
+
+    it 'records use' do
+      expect(subject.send(:recently_used_ids, at_time)).to eq [status.id]
+    end
+  end
+
+  describe '#query' do
+    it 'returns a composable query scope' do
+      expect(subject.query).to be_a Trends::Query
+    end
+
+    it 'responds to filtered_for' do
+      expect(subject.query).to respond_to(:filtered_for)
+    end
+  end
+
+  describe '#refresh' do
+    let!(:today) { at_time }
+    let!(:yesterday) { today - 1.day }
+
+    let!(:status1) { Fabricate(:status, text: 'Foo', trendable: true, created_at: yesterday) }
+    let!(:status2) { Fabricate(:status, text: 'Bar', trendable: true, created_at: today) }
+    let!(:status3) { Fabricate(:status, text: 'Baz', trendable: true, created_at: today) }
+
+    before do
+      13.times { reblog(status1, today) }
+      13.times { reblog(status2, today) }
+       4.times { reblog(status3, today) }
+    end
+
+    context do
+      before do
+        subject.refresh(today)
+      end
+
+      it 'calculates and re-calculates scores' do
+        expect(subject.query.limit(10).to_a).to eq [status2, status1]
+      end
+
+      it 'omits statuses below threshold' do
+        expect(subject.query.limit(10).to_a).to_not include(status3)
+      end
+    end
+
+    it 'decays scores' do
+      subject.refresh(today)
+      original_score = subject.score(status2.id)
+      expect(original_score).to be_a Float
+      subject.refresh(today + subject.options[:score_halflife])
+      decayed_score = subject.score(status2.id)
+      expect(decayed_score).to be <= original_score / 2
+    end
+  end
+
+  def reblog(status, at_time)
+    reblog = Fabricate(:status, reblog: status, created_at: at_time)
+    subject.add(status, reblog.account_id, at_time)
+  end
+end
diff --git a/spec/models/trends/tags_spec.rb b/spec/models/trends/tags_spec.rb
index 4f98c6aa4..f48c73503 100644
--- a/spec/models/trends/tags_spec.rb
+++ b/spec/models/trends/tags_spec.rb
@@ -21,7 +21,7 @@ RSpec.describe Trends::Tags do
     end
   end
 
-  describe '#get' do
+  describe '#query' do
     pending
   end
 
@@ -47,11 +47,11 @@ RSpec.describe Trends::Tags do
       end
 
       it 'calculates and re-calculates scores' do
-        expect(subject.get(false, 10)).to eq [tag1, tag3]
+        expect(subject.query.limit(10).to_a).to eq [tag1, tag3]
       end
 
       it 'omits hashtags below threshold' do
-        expect(subject.get(false, 10)).to_not include(tag2)
+        expect(subject.query.limit(10).to_a).to_not include(tag2)
       end
     end