Facebook Chat’s integration with Jabber/XMPP is just around the corner which means you’ll be able to use applications like Gtalk to communicate on Facebook.
Once launched, Facebook will allow chat applications like Gtalk to let their users communicate with their friends, see which of their friends are online and view their profile pictures as well as set their statuses.
With Facebook giving their 300 million users access to the protocol it will mean XMPP becoming the most popular instant messaging protocol on the planet.
XMPP (Extensible Messaging and Presence Protocol) was developed by the Jabber open-source community in 1999. It’s an open, XML-based protocol originally aimed at near-real-time, extensible instant messaging (IM) and presence information. It’s most recent claim to fame, Google Wave.
Google Wave’s federation protocol is an open extension to the XMPP protocol.