Not sure how good of a social protocol it is, but I see ATProto/PDS as a possible succesor to solid [1], if they implment the permissioned data access model correctly. Which would certainly have a lot of good usecases, beyond social apps.

[1] solid: https://solidproject.org/about

Wow I had no idea, thank you for your well-reasoned critique! I can tell you're very capable of evaluating the merits of complex socio-technological systems. Your wisdom is unparalleled; now I see we all should just keep using X and GitHub.

This comment seems to lack nuance

I agree (with caveats and not as strongly), but claiming no utility is a bit much.