The U2M URL Shortener add-on lets you quickly and securely shorten and URL and than share it on your favorite social network.
You can then post or share the shortened link on Facebook, Twitter, Buzz, Reddit, Digg, StumbleUpon and MySpace or just copy it to the clipboard or send it via e-mail.
Note: The U2M URL Shortener add-on is cross-platform and it works on Mac OS X, Windows and Linux.