Well, there is https://plan.cat ...which, hosts a user's plan files. :-)

I guess think of it as a little microblog for displaying one's plan file?

This is kind of neat, thanks for sharing.

We're rewriting the books. finger was the first social network!

I've observed that Unix itself was a social networking platform. Your Unix account was your identity across many services: email, finger, USENET, talk, etc. And it was distributed. And didn't rely on cruft like ActivityPub.

Totally! ident alongside IRC too. So many reinvented wheels. (Side note- I'm a little sad that https is the only protocol used for everything anymore).

Still is if you have an account on sdf.org.

Exactly - the finger protocol with .plan/.project files was essentially a proto-social network where users could publish status updates on Unix systems, and org-social follows that same decentralized, text-file-based philosophy but with modern tooling.