Facebook Instant Messenger
Tuesday November 3, 2009
Facebook offers instant messaging and group chat features! Yes, you can log into your Facebook account, send "whispers" and messages to your buddies, and even collect them all into a group chat room. These Facebook features work quite well, and are becoming very popular with millions of users. About.com tells us more about Facebook IM and chat...

it is same module witch is using in orkut..
orkut had integrate Gtalk,