More likely a XMPP MUC [0], given that part of Facebook's architecture involves XMPP (as far as I remember you can login on your XMPP client with your Facebook

More likely a XMPP MUC [0], given that part of Facebook's architecture involves XMPP (as far as I remember you can login on your XMPP client with your Facebook credentials and discuss with your Facebook contacts but not with other contacts) If this is true and they later open up federation, it will be awesome. [0] http://xmpp.org/extensions/xep-0045.html http://xmpp.org/extensions/xep-0045.html EDIT: it appears you can't connect with your Facebook credentials (link is blocked here, had to read it somewhere else)