farcaster

Farcaster is a Sufficient decentralization social network. It is an open protocol that can support multiple clients, similar to email.

Users always have the freedom to move their social identity between applications, and developers always have the freedom to build applications with new features on the network.

Is it like mastodon?

The llllvvuu one seems to be farcaster://profiles/0xd6E4F71f973B8901953dCc26cB5b932Ba0e07ca0.