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I forget where I read it now but if memory serves that was part of the reason why Google Talk xmpp federation was turned off because Facebook was importing Google Talk users but then not also sharing the xmpp federation so in order to stop bleeding users, Google Talk turned off their xmpp federation.

This is an anecdote until I can find a source.

Facebook never supported XMPP federation - only chat with Facebook contacts.

Hmm, I don't remember, but I doubt it. The point of FB Messenger using XMPP was that you could add your FB account to your XMPP client and chat with your friends from there