Rated 4 out of 5 stars

Usefull add-on for social networks and sharing users/addicts, except for the privacy leak.
For the later, a greasemonkey might do the job (i.e. forbid the css file being loaded)
Privacy statement is located @ http://bit.ly/pages/privacy rather than on the link provided on the Install Page here.
Amongst the contendents you might want to check 'Long URL Please Mod' with deals with over 180 shorteners :)