diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index e43875544a..5ed8499aad 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,54 +1,4 @@
 module ApplicationHelper
-  def unique_tag(date, id, type)
-    "tag:#{Rails.configuration.x.local_domain},#{date.strftime('%Y-%m-%d')}:objectId=#{id}:objectType=#{type}"
-  end
-
-  def unique_tag_to_local_id(tag, expected_type)
-    matches = Regexp.new("objectId=([\\d]+):objectType=#{expected_type}").match(tag)
-    return matches[1] unless matches.nil?
-  end
-
-  def local_id?(id)
-    id.start_with?("tag:#{Rails.configuration.x.local_domain}")
-  end
-
-  def content_for_status(actual_status)
-    if actual_status.local?
-      linkify(actual_status)
-    else
-      sanitize(actual_status.content, tags: %w(a br p), attributes: %w(href rel))
-    end
-  end
-
-  def account_from_mentions(search_string, mentions)
-    mentions.each { |x| return x.account if x.account.acct.eql?(search_string) }
-    nil
-
-    # If that was unsuccessful, try fetching user from db separately
-    # But this shouldn't ever happen if the mentions were created correctly!
-    # username, domain = search_string.split('@')
-
-    # if domain == Rails.configuration.x.local_domain
-    #   account = Account.find_local(username)
-    # else
-    #   account = Account.find_remote(username, domain)
-    # end
-
-    # account
-  end
-
-  def linkify(status)
-    auto_link(HTMLEntities.new.encode(status.text), link: :urls, html: { rel: 'nofollow noopener' }).gsub(Account::MENTION_RE) do |m|
-      account = account_from_mentions(Account::MENTION_RE.match(m)[1], status.mentions)
-
-      unless account.nil?
-        "#{m.split('@').first}<a href=\"#{url_for_target(account)}\" class=\"mention\">@<span>#{account.acct}</span></a>"
-      else
-        m
-      end
-    end.html_safe
-  end
-
   def active_nav_class(path)
     current_page?(path) ? 'active' : ''
   end
diff --git a/app/helpers/atom_builder_helper.rb b/app/helpers/atom_builder_helper.rb
index c8046182fa..39ea20e312 100644
--- a/app/helpers/atom_builder_helper.rb
+++ b/app/helpers/atom_builder_helper.rb
@@ -16,7 +16,7 @@ module AtomBuilderHelper
   end
 
   def unique_id(xml, date, id, type)
-    xml.id_ unique_tag(date, id, type)
+    xml.id_ TagManager.instance.unique_tag(date, id, type)
   end
 
   def simple_id(xml, id)
@@ -97,32 +97,8 @@ module AtomBuilderHelper
     xml['thr'].send('in-reply-to', { ref: uri, href: url, type: 'text/html' })
   end
 
-  def uri_for_target(target)
-    if target.local?
-      if target.object_type == :person
-        account_url(target)
-      else
-        unique_tag(target.stream_entry.created_at, target.stream_entry.activity_id, target.stream_entry.activity_type)
-      end
-    else
-      target.uri
-    end
-  end
-
-  def url_for_target(target)
-    if target.local?
-      if target.object_type == :person
-        account_url(target)
-      else
-        account_stream_entry_url(target.account, target.stream_entry)
-      end
-    else
-      target.url
-    end
-  end
-
   def link_mention(xml, account)
-    xml.link(rel: 'mentioned', href: uri_for_target(account))
+    xml.link(rel: 'mentioned', href: TagManager.instance.uri_for(account))
   end
 
   def link_enclosure(xml, media)
@@ -145,7 +121,7 @@ module AtomBuilderHelper
 
   def conditionally_formatted(activity)
     if activity.is_a?(Status)
-      content_for_status(activity.reblog? ? activity.reblog : activity)
+      Formatter.instance.format(activity.reblog? ? activity.reblog : activity)
     elsif activity.nil?
       nil
     else
@@ -155,11 +131,11 @@ module AtomBuilderHelper
 
   def include_author(xml, account)
     object_type      xml, :person
-    uri              xml, uri_for_target(account)
+    uri              xml, TagManager.instance.uri_for(account)
     name             xml, account.username
     email            xml, account.local? ? "#{account.acct}@#{Rails.configuration.x.local_domain}" : account.acct
     summary          xml, account.note
-    link_alternate   xml, url_for_target(account)
+    link_alternate   xml, TagManager.instance.url_for(account)
     link_avatar      xml, account
     portable_contact xml, account
   end
@@ -176,7 +152,7 @@ module AtomBuilderHelper
 
     # Comments need thread element
     if stream_entry.threaded?
-      in_reply_to xml, uri_for_target(stream_entry.thread), url_for_target(stream_entry.thread)
+      in_reply_to xml, TagManager.instance.uri_for(stream_entry.thread), TagManager.instance.url_for(stream_entry.thread)
     end
 
     if stream_entry.targeted?
@@ -185,9 +161,9 @@ module AtomBuilderHelper
           include_author xml, stream_entry.target
         else
           object_type    xml, stream_entry.target.object_type
-          simple_id      xml, uri_for_target(stream_entry.target)
+          simple_id      xml, TagManager.instance.uri_for(stream_entry.target)
           title          xml, stream_entry.target.title
-          link_alternate xml, url_for_target(stream_entry.target)
+          link_alternate xml, TagManager.instance.url_for(stream_entry.target)
         end
 
         # Statuses have content and author
diff --git a/app/lib/feed_manager.rb b/app/lib/feed_manager.rb
index a19d06a85a..a0c480b94b 100644
--- a/app/lib/feed_manager.rb
+++ b/app/lib/feed_manager.rb
@@ -1,11 +1,15 @@
+require 'singleton'
+
 class FeedManager
+  include Singleton
+
   MAX_ITEMS = 800
 
-  def self.key(type, id)
+  def key(type, id)
     "feed:#{type}:#{id}"
   end
 
-  def self.filter_status?(status, follower)
+  def filter_status?(status, follower)
     replied_to_user = status.reply? ? status.thread.account : nil
     (status.reply? && !(follower.id = replied_to_user.id || follower.following?(replied_to_user)))
   end
diff --git a/app/lib/formatter.rb b/app/lib/formatter.rb
new file mode 100644
index 0000000000..52e2295208
--- /dev/null
+++ b/app/lib/formatter.rb
@@ -0,0 +1,47 @@
+require 'singleton'
+
+class Formatter
+  include Singleton
+
+  include ActionView::Helpers::TextHelper
+  include ActionView::Helpers::SanitizeHelper
+
+  def format(status)
+    return reformat(status) unless status.local?
+
+    html = status.text
+    html = encode(html)
+    html = link_urls(html)
+    html = link_mentions(html, status.mentions)
+
+    html.html_safe
+  end
+
+  def reformat(status)
+    sanitize(status.content, tags: %w(a br p), attributes: %w(href rel))
+  end
+
+  private
+
+  def encode(html)
+    HTMLEntities.new.encode(html)
+  end
+
+  def link_urls(html)
+    auto_link(html, link: :urls, html: { rel: 'nofollow noopener' })
+  end
+
+  def link_mentions(html, mentions)
+    html.gsub(Account::MENTION_RE) do |match|
+      acct    = Account::MENTION_RE.match(match)[1]
+      mention = mentions.find { |mention| mention.account.acct.eql?(acct) }
+
+      return match if mention.nil?
+      mention_html(match, mention.account)
+    end
+  end
+
+  def mention_html(match, account)
+    "#{match.split('@').first}<a href=\"#{TagManager.instance.url_for(account)}\" class=\"mention\">@<span>#{account.acct}</span></a>"
+  end
+end
diff --git a/app/lib/tag_manager.rb b/app/lib/tag_manager.rb
new file mode 100644
index 0000000000..4d29ca1f8b
--- /dev/null
+++ b/app/lib/tag_manager.rb
@@ -0,0 +1,41 @@
+require 'singleton'
+
+class TagManager
+  include Singleton
+  include RoutingHelper
+
+  def unique_tag(date, id, type)
+    "tag:#{Rails.configuration.x.local_domain},#{date.strftime('%Y-%m-%d')}:objectId=#{id}:objectType=#{type}"
+  end
+
+  def unique_tag_to_local_id(tag, expected_type)
+    matches = Regexp.new("objectId=([\\d]+):objectType=#{expected_type}").match(tag)
+    return matches[1] unless matches.nil?
+  end
+
+  def local_id?(id)
+    id.start_with?("tag:#{Rails.configuration.x.local_domain}")
+  end
+
+  def uri_for(target)
+    return target.uri if target.respond_to?(:local?) && !target.local?
+
+    case target.object_type
+    when :person
+      account_url(target)
+    else
+      unique_tag(target.stream_entry.created_at, target.stream_entry.activity_id, target.stream_entry.activity_type)
+    end
+  end
+
+  def url_for(target)
+    return target.url if target.respond_to?(:local?) && !target.local?
+
+    case target.object_type
+    when :person
+      account_url(target)
+    else
+      account_stream_entry_url(target.account, target.stream_entry)
+    end
+  end
+end
diff --git a/app/models/feed.rb b/app/models/feed.rb
index e7574956e5..bc3e960d46 100644
--- a/app/models/feed.rb
+++ b/app/models/feed.rb
@@ -21,7 +21,7 @@ class Feed
   private
 
   def key
-    FeedManager.key(@type, @account.id)
+    FeedManager.instance.key(@type, @account.id)
   end
 
   def redis
diff --git a/app/services/fan_out_on_write_service.rb b/app/services/fan_out_on_write_service.rb
index d51681e538..973451e339 100644
--- a/app/services/fan_out_on_write_service.rb
+++ b/app/services/fan_out_on_write_service.rb
@@ -15,7 +15,7 @@ class FanOutOnWriteService < BaseService
 
   def deliver_to_followers(status)
     status.account.followers.each do |follower|
-      next if !follower.local? || FeedManager.filter_status?(status, follower)
+      next if !follower.local? || FeedManager.instance.filter_status?(status, follower)
       push(:home, follower, status)
     end
   end
@@ -29,16 +29,16 @@ class FanOutOnWriteService < BaseService
   end
 
   def push(type, receiver, status)
-    redis.zadd(FeedManager.key(type, receiver.id), status.id, status.id)
+    redis.zadd(FeedManager.instance.key(type, receiver.id), status.id, status.id)
     trim(type, receiver)
     ActionCable.server.broadcast("timeline:#{receiver.id}", type: 'update', timeline: type, message: inline_render(receiver, status))
   end
 
   def trim(type, receiver)
-    return unless redis.zcard(FeedManager.key(type, receiver.id)) > FeedManager::MAX_ITEMS
+    return unless redis.zcard(FeedManager.instance.key(type, receiver.id)) > FeedManager::MAX_ITEMS
 
-    last = redis.zrevrange(FeedManager.key(type, receiver.id), FeedManager::MAX_ITEMS - 1, FeedManager::MAX_ITEMS - 1)
-    redis.zremrangebyscore(FeedManager.key(type, receiver.id), '-inf', "(#{last.last}")
+    last = redis.zrevrange(FeedManager.instance.key(type, receiver.id), FeedManager::MAX_ITEMS - 1, FeedManager::MAX_ITEMS - 1)
+    redis.zremrangebyscore(FeedManager.instance.key(type, receiver.id), '-inf', "(#{last.last}")
   end
 
   def redis
diff --git a/app/services/precompute_feed_service.rb b/app/services/precompute_feed_service.rb
index c8050bbd0d..df2330d092 100644
--- a/app/services/precompute_feed_service.rb
+++ b/app/services/precompute_feed_service.rb
@@ -7,8 +7,8 @@ class PrecomputeFeedService < BaseService
     instant_return = []
 
     Status.send("as_#{type}_timeline", account).order('created_at desc').limit(FeedManager::MAX_ITEMS).each do |status|
-      next if type == :home && FeedManager.filter_status?(status, account)
-      redis.zadd(FeedManager.key(type, account.id), status.id, status.id)
+      next if type == :home && FeedManager.instance.filter_status?(status, account)
+      redis.zadd(FeedManager.instance.key(type, account.id), status.id, status.id)
       instant_return << status unless instant_return.size > limit
     end
 
diff --git a/app/services/process_feed_service.rb b/app/services/process_feed_service.rb
index 97033a0047..ba7558e1f2 100644
--- a/app/services/process_feed_service.rb
+++ b/app/services/process_feed_service.rb
@@ -39,10 +39,10 @@ class ProcessFeedService < BaseService
     # Also record all media attachments for the status and for the reblogged status if present
     unless status.new_record?
       record_remote_mentions(status, entry.xpath('./xmlns:link[@rel="mentioned"]'))
-      
+
       process_attachments(entry, status)
       process_attachments(entry.xpath('./activity:object'), status.reblog) if status.reblog?
-      
+
       DistributionWorker.perform_async(status.id)
     end
   end
@@ -112,8 +112,8 @@ class ProcessFeedService < BaseService
   def find_original_status(_xml, id)
     return nil if id.nil?
 
-    if local_id?(id)
-      Status.find(unique_tag_to_local_id(id, 'Status'))
+    if TagManager.instance.local_id?(id)
+      Status.find(TagManager.instance.unique_tag_to_local_id(id, 'Status'))
     else
       Status.find_by(uri: id)
     end
diff --git a/app/services/process_interaction_service.rb b/app/services/process_interaction_service.rb
index 536911e2f5..d9fcf9032d 100644
--- a/app/services/process_interaction_service.rb
+++ b/app/services/process_interaction_service.rb
@@ -45,7 +45,7 @@ class ProcessInteractionService < BaseService
   end
 
   def mentions_account?(xml, account)
-    xml.xpath('/xmlns:entry/xmlns:link[@rel="mentioned"]').each { |mention_link| return true if mention_link.attribute('href').value == url_for_target(account) }
+    xml.xpath('/xmlns:entry/xmlns:link[@rel="mentioned"]').each { |mention_link| return true if mention_link.attribute('href').value == TagManager.instance.url_for(account) }
     false
   end
 
@@ -85,7 +85,7 @@ class ProcessInteractionService < BaseService
   end
 
   def status(xml)
-    Status.find(unique_tag_to_local_id(activity_id(xml), 'Status'))
+    Status.find(TagManager.instance.unique_tag_to_local_id(activity_id(xml), 'Status'))
   end
 
   def activity_id(xml)
diff --git a/app/services/remove_status_service.rb b/app/services/remove_status_service.rb
index db043df08b..e48a43be07 100644
--- a/app/services/remove_status_service.rb
+++ b/app/services/remove_status_service.rb
@@ -44,7 +44,7 @@ class RemoveStatusService < BaseService
   end
 
   def unpush(type, receiver, status)
-    redis.zremrangebyscore(FeedManager.key(type, receiver.id), status.id, status.id)
+    redis.zremrangebyscore(FeedManager.instance.key(type, receiver.id), status.id, status.id)
     ActionCable.server.broadcast("timeline:#{receiver.id}", type: 'delete', id: status.id)
   end
 
diff --git a/app/views/accounts/_grid_card.html.haml b/app/views/accounts/_grid_card.html.haml
index d107f5274e..f65b78470c 100644
--- a/app/views/accounts/_grid_card.html.haml
+++ b/app/views/accounts/_grid_card.html.haml
@@ -2,7 +2,7 @@
   .account-grid-card__header
     .avatar= image_tag account.avatar.url(:medium)
     .name
-      = link_to url_for_target(account) do
+      = link_to TagManager.instance.url_for(account) do
         %span.display_name= display_name(account)
         %span.username= "@#{account.acct}"
   %p.note= truncate(strip_tags(account.note), length: 150)
diff --git a/app/views/accounts/show.atom.ruby b/app/views/accounts/show.atom.ruby
index 8a7bc1b929..d7b2201d40 100644
--- a/app/views/accounts/show.atom.ruby
+++ b/app/views/accounts/show.atom.ruby
@@ -10,7 +10,7 @@ Nokogiri::XML::Builder.new do |xml|
       include_author xml, @account
     end
 
-    link_alternate xml, url_for_target(@account)
+    link_alternate xml, TagManager.instance.url_for(@account)
     link_self      xml, account_url(@account, format: 'atom')
     link_hub       xml, Rails.configuration.x.hub_url
     link_salmon    xml, api_salmon_url(@account.id)
diff --git a/app/views/api/accounts/show.rabl b/app/views/api/accounts/show.rabl
index 4f7cee680e..d779393d13 100644
--- a/app/views/api/accounts/show.rabl
+++ b/app/views/api/accounts/show.rabl
@@ -2,7 +2,7 @@ object @account
 
 attributes :id, :username, :acct, :display_name, :note
 
-node(:url)             { |account| url_for_target(account) }
+node(:url)             { |account| TagManager.instance.url_for(account) }
 node(:avatar)          { |account| full_asset_url(account.avatar.url(:large, false)) }
 node(:followers_count) { |account| account.followers.count }
 node(:following_count) { |account| account.following.count }
diff --git a/app/views/api/statuses/show.rabl b/app/views/api/statuses/show.rabl
index c7d028e141..047436b611 100644
--- a/app/views/api/statuses/show.rabl
+++ b/app/views/api/statuses/show.rabl
@@ -1,9 +1,9 @@
 object @status
 attributes :id, :created_at, :in_reply_to_id
 
-node(:uri)              { |status| uri_for_target(status) }
-node(:content)          { |status| content_for_status(status) }
-node(:url)              { |status| url_for_target(status) }
+node(:uri)              { |status| TagManager.instance.uri_for(status) }
+node(:content)          { |status| Formatter.instance.format(status) }
+node(:url)              { |status| TagManager.instance.url_for(status) }
 node(:reblogs_count)    { |status| status.reblogs_count }
 node(:favourites_count) { |status| status.favourites_count }
 node(:favourited)       { |status| current_account.favourited?(status) }
diff --git a/app/views/notification_mailer/follow.text.erb b/app/views/notification_mailer/follow.text.erb
index 6f70c0d901..a13b6d7a99 100644
--- a/app/views/notification_mailer/follow.text.erb
+++ b/app/views/notification_mailer/follow.text.erb
@@ -2,4 +2,4 @@
 
 <%= @account.acct %> is now following you!
 
-<%= url_for_target(@account) %>
+<%= TagManager.instance.url_for(@account) %>
diff --git a/app/views/notification_mailer/mention.text.erb b/app/views/notification_mailer/mention.text.erb
index b093f4ec02..f3582749d4 100644
--- a/app/views/notification_mailer/mention.text.erb
+++ b/app/views/notification_mailer/mention.text.erb
@@ -4,4 +4,4 @@ You were mentioned by <%= @status.account.acct %> in:
 
 <%= strip_tags(@status.content) %>
 
-<%= url_for_target(@status) %>
+<%= TagManager.instance.url_for(@status) %>
diff --git a/app/views/stream_entries/_follow.html.haml b/app/views/stream_entries/_follow.html.haml
index f19e8783d9..f6ec8c4f5b 100644
--- a/app/views/stream_entries/_follow.html.haml
+++ b/app/views/stream_entries/_follow.html.haml
@@ -2,4 +2,4 @@
   .content
     %strong= link_to follow.account.acct, account_path(follow.account)
     is now following
-    %strong= link_to follow.target_account.acct, url_for_target(follow.target_account)
+    %strong= link_to follow.target_account.acct, TagManager.instance.url_for(follow.target_account)
diff --git a/app/views/stream_entries/_status.html.haml b/app/views/stream_entries/_status.html.haml
index ece31d0e2b..a0afccd396 100644
--- a/app/views/stream_entries/_status.html.haml
+++ b/app/views/stream_entries/_status.html.haml
@@ -12,7 +12,7 @@
     .pre-header
       %i.fa.fa-retweet
       Shared by
-      = link_to display_name(status.account), url_for_target(status.account), class: 'name'
+      = link_to display_name(status.account), TagManager.instance.url_for(status.account), class: 'name'
 
   .entry__container
     .avatar
@@ -21,10 +21,10 @@
     .entry__container__container
       .header
         .header__left
-          = link_to url_for_target(proper_status(status).account), class: 'name' do
+          = link_to TagManager.instance.url_for(proper_status(status).account), class: 'name' do
             %strong= display_name(proper_status(status).account)
             = "@#{proper_status(status).account.acct}"
-          = link_to url_for_target(proper_status(status)), class: 'time' do
+          = link_to TagManager.instance.url_for(proper_status(status)), class: 'time' do
             %span{ title: proper_status(status).created_at }
               = relative_time(proper_status(status).created_at)
 
@@ -36,7 +36,7 @@
             %i.fa.fa-star
             %span.counter-number= proper_status(status).favourites_count
 
-      .content= content_for_status(proper_status(status))
+      .content= Formatter.instance.format(proper_status(status))
 
       %ul.media-attachments
         - status.media_attachments.each do |media|
diff --git a/app/views/xrd/webfinger.xml.ruby b/app/views/xrd/webfinger.xml.ruby
index 7c920b678d..d633e3477f 100644
--- a/app/views/xrd/webfinger.xml.ruby
+++ b/app/views/xrd/webfinger.xml.ruby
@@ -1,8 +1,8 @@
 Nokogiri::XML::Builder.new do |xml|
   xml.XRD(xmlns: 'http://docs.oasis-open.org/ns/xri/xrd-1.0') do
     xml.Subject @canonical_account_uri
-    xml.Alias url_for_target(@account)
-    xml.Link(rel: 'http://webfinger.net/rel/profile-page', type: 'text/html', href: url_for_target(@account))
+    xml.Alias TagManager.instance.url_for(@account)
+    xml.Link(rel: 'http://webfinger.net/rel/profile-page', type: 'text/html', href: TagManager.instance.url_for(@account))
     xml.Link(rel: 'http://schemas.google.com/g/2010#updates-from', type: 'application/atom+xml', href: account_url(@account, format: 'atom'))
     xml.Link(rel: 'salmon', href: api_salmon_url(@account.id))
     xml.Link(rel: 'magic-public-key', href: @magic_key)
diff --git a/spec/controllers/oauth/applications_controller_spec.rb b/spec/controllers/oauth/applications_controller_spec.rb
index 350d5d521d..ecd8b16c65 100644
--- a/spec/controllers/oauth/applications_controller_spec.rb
+++ b/spec/controllers/oauth/applications_controller_spec.rb
@@ -1,8 +1,15 @@
 require 'rails_helper'
 
 RSpec.describe Oauth::ApplicationsController, type: :controller do
+  before do
+    sign_in Fabricate(:user), scope: :user
+  end
+
   describe 'GET #index' do
-    it 'returns http success'
+    it 'returns http success' do
+      get :index
+      expect(response).to have_http_status(:success)
+    end
   end
 
   describe 'POST #create' do
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index 9f68a504ae..c2063c9958 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -1,59 +1,5 @@
 require 'rails_helper'
 
 RSpec.describe ApplicationHelper, type: :helper do
-  let(:local_domain) { Rails.configuration.x.local_domain }
 
-  describe '#unique_tag' do
-    it 'returns a string' do
-      expect(helper.unique_tag(Time.now, 12, 'Status')).to be_a String
-    end
-  end
-
-  describe '#unique_tag_to_local_id' do
-    it 'returns the ID part' do
-      expect(helper.unique_tag_to_local_id("tag:#{local_domain};objectId=12:objectType=Status", 'Status')).to eql '12'
-    end
-  end
-
-  describe '#local_id?' do
-    it 'returns true for a local ID' do
-      expect(helper.local_id?("tag:#{local_domain};objectId=12:objectType=Status")).to be true
-    end
-
-    it 'returns false for a foreign ID' do
-      expect(helper.local_id?('tag:foreign.tld;objectId=12:objectType=Status')).to be false
-    end
-  end
-
-  describe '#linkify' do
-    let(:alice) { Fabricate(:account, username: 'alice') }
-    let(:bob) { Fabricate(:account, username: 'bob', domain: 'example.com', url: 'http://example.com/bob') }
-
-    it 'turns mention of remote user into link' do
-      status = Fabricate(:status, text: 'Hello @bob@example.com', account: bob)
-      status.mentions.create(account: bob)
-      expect(helper.linkify(status)).to match('<a href="http://example.com/bob" class="mention">@<span>bob@example.com</span></a>')
-    end
-
-    it 'turns mention of local user into link' do
-      status = Fabricate(:status, text: 'Hello @alice', account: bob)
-      status.mentions.create(account: alice)
-      expect(helper.linkify(status)).to match('<a href="http://test.host/users/alice" class="mention">@<span>alice</span></a>')
-    end
-
-    it 'leaves mention of unresolvable user alone' do
-      status = Fabricate(:status, text: 'Hello @foo', account: bob)
-      expect(helper.linkify(status)).to match('Hello @foo')
-    end
-  end
-
-  describe '#account_from_mentions' do
-    let(:bob) { Fabricate(:account, username: 'bob', domain: 'example.com') }
-    let(:status) { Fabricate(:status, text: 'Hello @bob@example.com', account: bob) }
-    let(:mentions) { [Mention.create(status: status, account: bob)] }
-
-    it 'returns account' do
-      expect(helper.account_from_mentions('bob@example.com', mentions)).to eq bob
-    end
-  end
 end
diff --git a/spec/helpers/atom_builder_helper_spec.rb b/spec/helpers/atom_builder_helper_spec.rb
index 7366b5b791..7e11a8a772 100644
--- a/spec/helpers/atom_builder_helper_spec.rb
+++ b/spec/helpers/atom_builder_helper_spec.rb
@@ -20,7 +20,7 @@ RSpec.describe AtomBuilderHelper, type: :helper do
   describe '#unique_id' do
     it 'creates an id' do
       time = Time.now
-      expect(used_in_builder { |xml| helper.unique_id(xml, time, 1, 'Status') }).to match "<id>#{helper.unique_tag(time, 1, 'Status')}</id>"
+      expect(used_in_builder { |xml| helper.unique_id(xml, time, 1, 'Status') }).to match "<id>#{TagManager.instance.unique_tag(time, 1, 'Status')}</id>"
     end
   end
 
@@ -146,18 +146,10 @@ RSpec.describe AtomBuilderHelper, type: :helper do
     let(:account) { Fabricate(:account, username: 'alice') }
 
     it 'creates a link' do
-      expect(used_in_builder { |xml| helper.link_mention(xml, account) }).to match '<link rel="mentioned" href="http://test.host/users/alice"/>'
+      expect(used_in_builder { |xml| helper.link_mention(xml, account) }).to match '<link rel="mentioned" href="https://cb6e6126.ngrok.io/users/alice"/>'
     end
   end
 
-  describe '#disambiguate_uri' do
-    pending
-  end
-
-  describe '#disambiguate_url' do
-    pending
-  end
-
   describe '#include_author' do
     pending
   end
diff --git a/spec/lib/feed_manager_spec.rb b/spec/lib/feed_manager_spec.rb
new file mode 100644
index 0000000000..4501e27b75
--- /dev/null
+++ b/spec/lib/feed_manager_spec.rb
@@ -0,0 +1,23 @@
+require 'rails_helper'
+
+RSpec.describe FeedManager do
+  describe '#key' do
+    subject { FeedManager.instance.key(:home, 1) }
+
+    it 'returns a string' do
+      expect(subject).to be_a String
+    end
+  end
+
+  describe '#filter_status?' do
+    let(:followee) { Fabricate(:account, username: 'alice') }
+    let(:status)   { Fabricate(:status, text: 'Hello world', account: followee) }
+    let(:follower) { Fabricate(:account, username: 'bob') }
+
+    subject { FeedManager.instance.filter_status?(status, follower) }
+
+    it 'returns a boolean value' do
+      expect(subject).to be false
+    end
+  end
+end
diff --git a/spec/lib/formatter_spec.rb b/spec/lib/formatter_spec.rb
new file mode 100644
index 0000000000..36c4af7481
--- /dev/null
+++ b/spec/lib/formatter_spec.rb
@@ -0,0 +1,39 @@
+require 'rails_helper'
+
+RSpec.describe Formatter do
+  let(:account)       { Fabricate(:account, username: 'alice') }
+  let(:local_status)  { Fabricate(:status, text: 'Hello world http://google.com', account: account) }
+  let(:remote_status) { Fabricate(:status, text: '<script>alert("Hello")</script> Beep boop', uri: 'beepboop', account: account) }
+
+  describe '#format' do
+    subject { Formatter.instance.format(local_status) }
+
+    it 'returns a string' do
+      expect(subject).to be_a String
+    end
+
+    it 'contains plain text' do
+      expect(subject).to match('Hello world')
+    end
+
+    it 'contains a link' do
+      expect(subject).to match('<a rel="nofollow noopener" href="http://google.com">http://google.com</a>')
+    end
+  end
+
+  describe '#reformat' do
+    subject { Formatter.instance.format(remote_status) }
+
+    it 'returns a string' do
+      expect(subject).to be_a String
+    end
+
+    it 'contains plain text' do
+      expect(subject).to match('Beep boop')
+    end
+
+    it 'does not contain scripts' do
+      expect(subject).to_not match('<script>alert("Hello")</script>')
+    end
+  end
+end
diff --git a/spec/lib/tag_manager_spec.rb b/spec/lib/tag_manager_spec.rb
new file mode 100644
index 0000000000..b605842538
--- /dev/null
+++ b/spec/lib/tag_manager_spec.rb
@@ -0,0 +1,107 @@
+require 'rails_helper'
+
+RSpec.describe TagManager do
+  let(:local_domain) { Rails.configuration.x.local_domain }
+
+  describe '#unique_tag' do
+    it 'returns a string' do
+      expect(TagManager.instance.unique_tag(Time.now, 12, 'Status')).to be_a String
+    end
+  end
+
+  describe '#unique_tag_to_local_id' do
+    it 'returns the ID part' do
+      expect(TagManager.instance.unique_tag_to_local_id("tag:#{local_domain};objectId=12:objectType=Status", 'Status')).to eql '12'
+    end
+  end
+
+  describe '#local_id?' do
+    it 'returns true for a local ID' do
+      expect(TagManager.instance.local_id?("tag:#{local_domain};objectId=12:objectType=Status")).to be true
+    end
+
+    it 'returns false for a foreign ID' do
+      expect(TagManager.instance.local_id?('tag:foreign.tld;objectId=12:objectType=Status')).to be false
+    end
+  end
+
+  describe '#uri_for' do
+    let(:alice)  { Fabricate(:account, username: 'alice') }
+    let(:bob)    { Fabricate(:account, username: 'bob') }
+    let(:status) { Fabricate(:status, text: 'Hello world', account: alice) }
+
+    subject { TagManager.instance.uri_for(target) }
+
+    context 'Account' do
+      let(:target) { alice }
+
+      it 'returns a string' do
+        expect(subject).to be_a String
+      end
+    end
+
+    context 'Status' do
+      let(:target) { status }
+
+      it 'returns a string' do
+        expect(subject).to be_a String
+      end
+    end
+
+    context 'Follow' do
+      let(:target) { Fabricate(:follow, account: alice, target_account: bob) }
+
+      it 'returns a string' do
+        expect(subject).to be_a String
+      end
+    end
+
+    context 'Favourite' do
+      let(:target) { Fabricate(:favourite, account: bob, status: status) }
+
+      it 'returns a string' do
+        expect(subject).to be_a String
+      end
+    end
+  end
+
+  describe '#url_for' do
+    let(:alice)  { Fabricate(:account, username: 'alice') }
+    let(:bob)    { Fabricate(:account, username: 'bob') }
+    let(:status) { Fabricate(:status, text: 'Hello world', account: alice) }
+
+    subject { TagManager.instance.url_for(target) }
+
+    context 'Account' do
+      let(:target) { alice }
+
+      it 'returns a URL' do
+        expect(subject).to be_a String
+      end
+    end
+
+    context 'Status' do
+      let(:target) { status }
+
+      it 'returns a URL' do
+        expect(subject).to be_a String
+      end
+    end
+
+    context 'Follow' do
+      let(:target) { Fabricate(:follow, account: alice, target_account: bob) }
+
+      it 'returns a URL' do
+        expect(subject).to be_a String
+      end
+    end
+
+    context 'Favourite' do
+      let(:target) { Fabricate(:favourite, account: bob, status: status) }
+
+      it 'returns a URL' do
+        expect(subject).to be_a String
+      end
+    end
+  end
+end
diff --git a/spec/models/account_spec.rb b/spec/models/account_spec.rb
index 9d19fd3b48..93731d1e4c 100644
--- a/spec/models/account_spec.rb
+++ b/spec/models/account_spec.rb
@@ -112,6 +112,10 @@ RSpec.describe Account, type: :model do
     pending
   end
 
+  describe '.find_remote' do
+    pending
+  end
+
   describe 'MENTION_RE' do
     subject { Account::MENTION_RE }
 
diff --git a/spec/models/media_attachment_spec.rb b/spec/models/media_attachment_spec.rb
index 0a16276845..5995aa4f4e 100644
--- a/spec/models/media_attachment_spec.rb
+++ b/spec/models/media_attachment_spec.rb
@@ -1,5 +1,5 @@
 require 'rails_helper'
 
 RSpec.describe MediaAttachment, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+
 end