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Messenger supported XMPP clients but didn't federate with other servers.

• kevincox 3y ago
  This is correct. Messenger never really was XMPP. It just had a client API based off of XMPP. There were a bunch of quriks and no federation. I suspect the idea was just that it provided a starting point for clients.
  • colinsane 3y ago
    my memory was just of running Pidgin and being able to reach everyone through it (google, FB, weirdo self-hosters). guess it must have had good multi-accounting support and i was relying on that. i assumed it was using the same code paths for all my contacts, but if not then i guess the "FB used XMPP" point would be almost entirely moot.
    • kevincox 3y ago
      I used FB Messenger over XMPP for the last handful of years before it was shut down using Pidgin and I'm pretty sure that's how it worked. You could talk to people on different networks but you needed your own FB account to talk on Messenger and you couldn't do group chats cross-network. GTalk and self-hosted XMPP could federate and you only needed one account and conversations could span servers.