If you had checked your Facebook account this morning, you would have been surprised to see some new additional features. They have introduced chat that lets you communicate with your friends who are online at the same time.The chat feature has been integrated very well and looks quite unobtrusive. The chat icon appears at the bottom right of the screen in the status bar. It is currently usable only in IE and Firefox. Unfortunately doesn't work in Opera.
The chat icon informs you of the number of people currently online. You can set your current informing others of your availability.
Once you click on the chat icon, it shows a list of people online and you can start the chat by clicking on a name.