Jack Dorsey just launched Buzz, a new open-source groupchat platform designed for teams of people and AI agents, built to replace Slack and GitHub. Model-agnostic. Decentralized. Self-sovereign. Open source. The pitch is simple. Current team communication tools are centralized and siloed. Buzz is designed from the ground up to treat AI agents as first-class participants alongside humans, not bolted-on integrations. This is Dorsey's latest move in a string of decentralized projects. Bluesky, Bitchat, and now a direct shot at enterprise collaboration tools.