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Unfortunately XMPP didn't take off. Notice how it's nowhere near as ubiquitous as email and web standards. Also notice how nearly all modern chat services don't support XMPP. I'd argue there are technical reasons for this situation. Try searching for "XMPP" in this thread for details.

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Except WhatsApp and until recently, Google Chat / Hangouts.

Yes, thank you. But none of them support XMPP federation (only Google supported it the past).

And I would add Facebook to your "until recently" example.

These services don't want federation. At all.

XMPP is an awful soup of incompatible servers and clients, though.

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