Shareaholic for Facebook - Mozilla Firefox Addon
Shareaholic is a firefox addon that allows the navigator user to share interesting webpages using Facebook, Twitter, Email, Gmail, Reader, Bookmarks, Buzz, Evernote, Bit.ly, and more... Works with 100+ services. This is a really simple to use tool for the link sharing of your favorite pages. If you constantly share websites you like with other facebook users this tool will be very handy.

Download Link:
Download Shareaholic.

The Facebook Toolbar for Firefox is a free extension for Firefox that lets you search the facebook from your browser and extend your Facebook experience into your everyday browsing.

To download the toolbar copy and paste this link in your navigator

http://developers.facebook.com/toolbar/

inTune allows you to know what is the most popular music among Facebook users, your Networks, or just your friends. This allows you to discover new artists from people who have similar tastes as you. In addition, inTunes helps you to discover new music by suggesting related artists or songs based on the songs you are currently playing in inTunes.