> A true social protocol should work like email. Any machine on the network should be able to talk it to any other machine

You may find littlefedi interesting

https://littleone.littlefedi.social/@stefano/blog/2026/08/07...

Then maybe what you want is email?

Sprinkled with a little bit of https://delta.chat ?

And potentially a dash of iroh https://news.ycombinator.com/item?id=48542480 https://www.iroh.computer/solutions/delta-chat ?

Any PDS can talk to another PDS, yes.