Email is the decentralized, ubiquitous social protocol that already exists!

A classic from Gordon: Everything Talks Email

Second Life allowed you to send an email to any object in the game.

Objects could also send emails out.

But if you wanted those messages to cause something on the other side to do something in response, the message had to be formatted exactly correct to work with the plain old code on the other side.

But imagine if you had an LLM on the other side!

Like forwarding to a person and knowing they'll do something reasonable.