Nostr
Nostr (Notes and Other Stuff Transmitted by Relays) is a decentralized, open protocol for social networking that enables censorship-resistant communication through a simple, relay-based architecture. It allows users to publish and subscribe to data (like posts, messages, and profiles) via independent relay servers, with cryptographic keys for identity and signing. Unlike traditional platforms, it has no central authority, relying on a network of interoperable relays and clients.
Developers should learn Nostr to build or integrate decentralized social applications that prioritize user control, privacy, and resistance to censorship, such as microblogging, messaging, or content-sharing tools. It's particularly useful for projects in Web3, open-source communities, or regions with restricted internet access, as it avoids single points of failure and allows for global, permissionless participation.