Two and a half weeks after Facebook Chat launched in beta to some US college users, as of early this morning Chat is now available for all Facebook users. Facebook has been slowly rolling out the launch since April 6 – users in San Francisco, Los Angeles, Philadelphia, New York, and Boston got access in recent days.
Scaling chat infrastructure is an extremely challenging technical problem. We haven’t received any reports of downtime for the service – a big achievement by the Facebook ops team.
So far, Facebook hasn’t made any announcements on whether Facebook Chat will support Jabber interoperability – though Facebook has suggested it would add Jabber support in the future. Facebook also hasn’t announced any plans to build chat APIs, which would be a major boon to those building chat services on the Facebook Platform.