I'd like to build a feature similar to Envolve's chat plugin on my site that would allow users to chat (no webcams) around specific topics, using Facebook Connect. Users must also be able to see present users that are not connected to them so the XMPP option is out. The live stream social plugin isn't sufficient because there doesn't seem to be tag filtering so having 5 different chats about 5 different topics for instance doesn't seem viable.
Can't you specify an xid... "If you have multiple live stream boxes on the same page, specify a unique xid for each."
http://developers.facebook.com/docs/reference/plugins/live-stream/