IMHO XMPP / Jabber is the best Instant Messenger (IM) protocol

https://feddit.dk/post/103685

IMHO XMPP / Jabber is the best Instant Messenger (IM) protocol - Feddit.dk

It is battle tested, standardized, widely used, have open source servers and apps, end-to-end encryption (OMEMO), self-hostable and are low on ressources and more. I use it with family and friends. Conversations and blabber.im [http://blabber.im] on android and Gajim on Linux. There’s also apps for windows and Apple. Curious if anyone here use it and why, why not?

IIRC Google Talk using XMPP and most major messengers having GTalk integration, they pretty much accidentally federated several messenger apps
They took out XMPP years ago. I had a lot of hope for the future when they first federated. Even ran my own server and was able to talk to Google Talk users. Alas...