Seeing posts you didn’t post? Did you click on a link in any “giveaway” teasers (or phony age verification requests) in your inbox? You’ve been hacked! Follow the tips to remove the bad HTML in your tumblr theme or description, and RESET your password!
Do not even think about clicking on those links in your inbox, or in any posts!
Check out this link for more info http://www.tumblr.com/tagged/tumblr-hack
