Blueskyとは何か？

Bluesky is a social app that is designed to not be controlled by a single company. We're creating a version of social media where it's built by many people, and it still comes together as a cohesive, easy-to-use experience. We've done this by building Bluesky on the AT Protocol, an open source toolbox for building social apps that can all talk to each other.

We want modern social media and public conversation online to work more like the early days of the web, where anyone could put up a blog or use RSS to subscribe to several blogs. We believe this will unlock a new era of experimentation and innovation in social media. Researchers and communities will have the ability to jump in to help solve the problems social networks currently face, and developers will be able to experiment with many new forms of interaction.

https://blueskyweb.zendesk.com/hc/en-us/articles/19002666608397-What-is-Bluesky