Tumblr is back up, after 4 hours of downtime. Official apology post: http://staff.tumblr.com/post/37811176241/a-message-from-the-team http://staff.tumblr.com/p

Tumblr is back up, after 4 hours of downtime. Official apology post: http://staff.tumblr.com/post/37811176241/a-message-from-the-team http://staff.tumblr.com/post/37811176241/a-message-from-the-...