Farcaster is a sufficiently decentralized social network. It is an open protocol that can support many clients, just like email. https://www.farcaster.xyz/

Dan Romero: Farcaster Two years ago, Varun and I started working together on an idea called RSS+. Our goal was to build a credibly-neutral protocol where users have direct relationships with their audiences and developers have the freedom to permissionlessly build new clients. We went through a few iterations and ultimately built Farcaster, a sufficiently decentralized protocol for building social networks.

Nov15'2022 just joined as @billseitz

Edited:    |       |    Search Twitter for discussion