you can now send direct messages to other authenticated users via the profile page or can view messages in navigation bar "you" and "message".
you can now see users karma/stats, follow users and create/edit your user profile.
valid youtube links to a video will now properly render an embed youtube video. https://www.youtube.com/watch?v=dQw4w9WgXcQ
authenticated users can now change username, email or password in 'settings' inside the 'you' menu in the navigation bar.
haha https://www.youtube.com/watch?v=xeKgAiRSWWg