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Re:Message from Facebook: this could be war by userbinator on Wednesday March 25, 2015 @08:04AM (#9262339)
IRC? I think that would be the closest analogue to email. Open standard, many implementations.
Re:Message from Facebook: this could be war by ForHackernews on Wednesday March 25, 2015 @08:20AM (#9262419)
XMPP (Jabber) is probably a more direct analogy. But the idea is similar. Unfortunately most of the big providers (Google, Facebook, etc) are disabling XMPP federation for their chat services, even if they still use the protocol internally.