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As far as I know the XMPP-AP gateway is pretty much here already, so XMPP should move to the right and be connected with much of the networking platforms. Perhaps highlighting the specific client software (Libervia & Movim) that currently support pub/sub blogging on XMPP, as opposed to just direct and group chat the protocol started with.
I’m also missing RSS/Atom protocols being highlighted in the diagram. While they aren’t bidirectional (or maybe because of it) they still create an immensely useful way to subscribe to content on the social web.