Shareaholic

Shareaholic is the ultimate add-on for the link sharing addict!If you use any site like Facebook, Twitter, MySpace, Digg, Google Gmail, StumbleUpon, etc you'll likely enjoy having Shareaholic by your side. Make your life easier. No more looking for web publisher provided buttons, and no more bookmarklets piling up. Grand Prize winner of the Extend Firefox contest, this add-on enables you to quickly, and very easily share, bookmark, and e-mail web pages via a wide array of your favorite web 2.0 social networking, bookmarking, blogging, and email services.