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Wasn't WhatsApp (Facebook messaging "app") based on XMPP at some point? And then they abandoned XMPP?
@vaporeon_ what i understand is WhatsApp was always using (and still is using!) XMPP but without federation. i don’t remember if Facebook Messenger (diffurent service lol) ever used XMPP. i do know Google had an XMPP-based chat service at one point that did eventually stop federation entirely (and maybe moved off XMPP?) after a lot of people had moved onto it
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@vaporeon_ Facebook Chat did apparently at one point offur an XMPP “interface” allowing you to log in via an XMPP client
@vaporeon_ this was befur they renamed it to Messenger