Bluesky
Public
Bluesky is a Seattle public benefit corporation operating a decentralized microblogging social network.
Founded
2021Bluesky is a Seattle public benefit corporation operating a decentralized microblogging social network.
Bluesky is a microblogging social network built on the AT Protocol, an open communication standard for distributed social networks. Users can publish 300-character posts containing text, images, and videos, and engage through replies, reposts, quote posts, and likes.
The platform differentiates itself through algorithmic choice, offering a marketplace of custom feeds where users select or create their own content algorithms. It provides user-managed moderation tools, including custom labeling services and moderation lists. Other features include domain-name-based handle verification, starter packs for community discovery, direct messaging, and third-party client support through public APIs.
Bluesky experienced rapid growth following its public launch in February 2024, with major user surges tied to controversies at rival platform X. The network reached 20 million users by November 2024 and approximately 38.5 million registered users by August 2025.
The platform has attracted significant communities of journalists, scientists, and left-leaning users seeking an alternative to X. It has seen strong adoption in Japan and Brazil, where X was briefly banned in 2024.
Daily active user metrics declined from their post-U.S. election peak by mid-2025. The company has raised over $36 million in funding and is exploring subscription services and custom domain hosting as revenue streams while pledging not to introduce advertising.
Bluesky primary competitive advantage lies in its decentralized architecture via the AT Protocol, which enables portable social identity and interoperability across services. Users own their data and can migrate between providers without losing their network.
The platform offers algorithmic choice through a marketplace of custom feeds, allowing users to curate their own content discovery rather than relying on a single corporate algorithm. Its robust community moderation system includes custom labelers, moderation lists, and open-source moderation software called Ozone. Domain-based handle verification provides a trust mechanism without platform-controlled checkmarks.
Bluesky has faced criticism for being perceived as a left-wing ideological bubble, with Pew Research Center analysis showing concentrated adoption among left-leaning users and limited ideological diversity. This polarization has raised concerns about the platform becoming an echo chamber that undermines meaningful dialogue across political perspectives.
The platform has also encountered content moderation challenges, including controversies over racial slurs in usernames and the need for robust trust and safety infrastructure to handle rapid user growth. Daily active users have declined significantly from their November 2024 peak, raising questions about long-term retention and sustainable engagement.