If you use Bit.ly service to shorten URL's, read the following articles and change your passwords ASAP

 

http://blog.bitly.com/post/85169217199/urgent-security-update-regarding-your-bitly-account

http://www.welivesecurity.com/2014/05/09/bitly-urgent-security-breach

 

And if you share the same password on other sites, change those too! You should really use a password manager....