Shareaholic for Google Chrome
The Chrome extension library offers numerous options for integrating Web content with social networking sites like Twitter or Facebook. Shareaholic is an extension of this ilk. I like it because it supports every popular social networking site (Twitter, Facebook, Digg, Reddit, LinkedIn) but also because it integrates with Gmail and Yahoo. Plus it's customizable. Share, save or e-mail the page you're visiting to Twitter, Facebook, Gmail, Google Reader and over 80 more. You can also share videos, blogs and images.