@smallcircles@social.coop I don't really see the fundamental or significant difference. They both impose constraints on expression either by way of the protocol or information structure. Useful for what's intended. (They don't strictly model real-life. No one really says "send me regular updates about your life activities", but the equivalent in person: "what's up?")
If comparison makes sense, good ol' blogging is generally broader on what can be communicated.
Human- and machine-readability being equal.