Bluesky is a microblogging social media platform similar to X/Twitter. It is owned by Bluesky Social PBC and based in the US.
It uses the AT protocol.
The platform has grown over time due to events such as Twitter being banned in Brazil and Elon Musk owning Twitter. The userbase has grown recently after wee Donald Trump took over the states and threw the place to shit and will be banning TikTok by the end of April.