Facebook never had "first-class integration". It was just a client bridge - you could login into Facebook Chat using your XMPP client, but it was a completely separate network, unlike Google Talk which was an actual federating XMPP server.
replyFair enough. (Although all the XMPP clients that I used supported multiple accounts, so it made little difference from where I was standing.)
replyIn any case, it contributed significantly to XMPP's reach and utility, and it's gone now.
(And my point regarding support on Google/Facebook was that their users could chat with me over XMPP without having to leave their familiar sites, sign up for anything new, or do anything else special. That put it in easy reach of the masses.)
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