I love facebook chat now due to the fact that it has support XMPP/jabber protokol. so from now on I can login to facebook chat using pidgin and not using the old pidgin facebook plugin that always buggy. you can learn how to set up your chat facebook client here. Things to note that you need to have a facebook username,
the one behind http://facebook.com/username
because that username will be your valid ID in XMPP/jabber protokol.