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Pidgin/libpurple worked a lot better when most chat services were variants of XMPP.

Now everything's proprietary and hostile to unofficial clients. Most Matrix bridges have to do stuff like scrape the webapps to work.




A lot of them are probably proprietary variants of XMPP or SIP. ISTR reading Facebook at least is like that.


IIUC Facebook Messenger is their own bespoke protocol on top of MQTT now. It seems even the web client speaks MQTT these days.




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