Facebook Chat now supports XMPP, finaly

Facebook social network finaly supports [[wk>XMPP]], better known as Jabber, for its chat. So it is possible to use it with various IM clients supporting Jabber. Therefore you needn’t to have the Facebook web opened to chat with all those hundreds of your friends. :-)

Your JID is your_login@chat.facebook.com. Therefore, login server is chat.facebook.com. Port is 5222. SSL/TLS encryption is not supported.

Howtos for various IM clients can be found on this page.