diff --git a/Gemfile b/Gemfile
index fc285d73..84b96363 100644
--- a/Gemfile
+++ b/Gemfile
@@ -57,13 +57,11 @@ gem 'redcarpet' #markdown formatting
 # Analytics
 gem 'mixpanel-ruby'
 gem 'barnes'
-
-# Sharing
-gem 'social-share-button'
+gem 'skylight'
 
 # Apps
 #gem 'easy_translate'
-gem 'levenshtein-ffi'
+#gem 'levenshtein-ffi'
 
 # Forum
 gem 'thredded'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4763c38e..f89e44e3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -236,8 +236,6 @@ GEM
       kaminari-core (= 1.1.1)
     kaminari-core (1.1.1)
     kramdown (1.17.0)
-    levenshtein-ffi (1.1.0)
-      ffi (~> 1.9)
     libv8 (6.7.288.46.1)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -460,9 +458,11 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
+    skylight (3.1.2)
+      skylight-core (= 3.1.2)
+    skylight-core (3.1.2)
+      activesupport (>= 4.2.0)
     slack-notifier (2.3.2)
-    social-share-button (1.1.0)
-      coffee-rails
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -562,7 +562,6 @@ DEPENDENCIES
   guard
   guard-minitest
   guard-rubocop
-  levenshtein-ffi
   material_icons
   medium-editor-rails
   memory_profiler
@@ -596,8 +595,8 @@ DEPENDENCIES
   serendipitous!
   shoulda-matchers (~> 3.1)
   simplecov
+  skylight
   slack-notifier
-  social-share-button
   sqlite3
   stackprof
   stripe
diff --git a/app/controllers/content_controller.rb b/app/controllers/content_controller.rb
index bce2f0db..595fc42b 100644
--- a/app/controllers/content_controller.rb
+++ b/app/controllers/content_controller.rb
@@ -40,7 +40,8 @@ class ContentController < ApplicationController
   def show
     content_type = content_type_from_controller(self.class)
     return redirect_to root_path unless valid_content_types.map(&:name).include?(content_type.name)
-    @content = content_type.find(params[:id])
+    @content = content_type.find_by(id: params[:id])
+    return redirect_to(root_path, notice: "You don't have permission to view that content.") if @content.nil?
     @serialized_content = ContentSerializer.new(@content)
 
     return redirect_to(root_path) if @content.user.nil? # deleted user's content
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 9435ea5a..f341616f 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -4,7 +4,9 @@ class UsersController < ApplicationController
   end
 
   def show
-    @user    = User.find(params[:id])
+    @user    = User.find_by(id: params[:id])
+    return redirect_to(root_path, notice: 'That user does not exist.') if @user.nil?
+
     @content = @user.public_content.select { |type, list| list.any? }
     @tabs    = @content.keys
     @stream  = @user.content_change_events.order('updated_at desc').limit(100).group_by do |cce|
diff --git a/config/initializers/social_share_button.rb b/config/initializers/social_share_button.rb
deleted file mode 100644
index 0d17d72a..00000000
--- a/config/initializers/social_share_button.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-SocialShareButton.configure do |config|
-  config.allow_sites = %w(twitter facebook google_plus weibo qq douban google_bookmark
-                          delicious tumblr pinterest email linkedin wechat vkontakte
-                          xing reddit hacker_news telegram odnoklassniki)
-end
diff --git a/config/skylight.yml b/config/skylight.yml
new file mode 100644
index 00000000..cffe8227
--- /dev/null
+++ b/config/skylight.yml
@@ -0,0 +1,4 @@
+---
+# The authentication token for the application.
+# I think this is actually ignored if the ENV var is set, but this is fine for reference / dummy data.
+authentication: ENV['SKYLIGHT_AUTHENTICATION']