If you like using messages on your Mac. Especially if you are up to date with Mac Mountain Lion and like the new notification center already then there is a very good news for you. There is a way to do Facebook chat from your Messages App. Yes! no need to login to Facebook to chat with your friends. Here’s how you do it…
First, find your Facebook username by going to http://www.facebook.com/your_user/. Next, Open iChat, then select iChat » Preferences and click on the Accounts tab.
Click on the + (plus) sign to add a new account, with these settings:
Account Type is Jabber Account
Account name is firstname.lastname@example.org, and enter your password
Click the drop-down arrow to reveal Server options. Enter chat.facebook.com as the server name.
Enter 5222 as the port and click Done. Check the screenshot below.
Click Done again, and you are good to go.