Farcaster is a protocol created in 2021 by Dan Romero and Varun Srinivasan.

Farcaster is a decentralized social network built on top of Ethereum. The Layer 1 blockchain manages user identities, while a Layer 2 network propagates updates between users. It offers: Secure, memorable, and human-readable user identifiers like @alice. Real-time settlement and propagation of changes between users. Decentralized access to all data on the network at reasonable costs.

• Farcaster is developed on GitHub and has 1,335 stars
• Farcaster first developed in https://github.com/farcasterxyz