@maffeis I like how the #IndieWeb is approaching this with #MicroPub and #MicroSub:
* https://indieweb.org/Micropub
* https://indieweb.org/Microsub
Clients can chose to implement one or both of those.
A typical social media app would implement both.
An app that’s meant only for authoring posts picks just MicroPub and an app that’s simply meant for consumption picks just MicroSub.
I find the #Fediverse / #Mastodon focus on #ActivityPub as the one and only API to be a bit lackluster in that regard.