Recently I've been thinking about how one might go about enforcing privacy/deletions on a distributed social network. You would need to have posts encrypted, and a distributed key management system that would allow revocations - anyone know of any work being done on this?

Presumably, you could have the DKMS w/ an updating shared secret via a double ratcheted gossip protocol. Membership would be revoked based on verification of a valid state? I haven't quite thought through it all and already getting pretty complex, so curious if smarter people have already given it some thought...