Bluesky (commonly abbreviated as Bsky) is a decentralized microblogging social platform. The platform was created by Bluesky Social, a public benefit corporation based in the United States, as a proof of concept for the AT Protocol, a communication protocol for decentralized social networks. Jay Graber is the company's CEO, with XMPP creator Jeremie Miller and Techdirt founder Mike Masnick serving on its board of directors. In addition to its website, the service is also accessible via apps for iOS and Android. The service is focused on microblogging, and has been called "Twitter-like".
A core feature of the service is its usage of domain names as handles. Users are assigned a generic subdomain handle after signing up (such as @example.bsky.social). Handles with the default *.bsky.social suffix redirect to the relevant user's page when visited in a web browser. They can choose to verify a domain or subdomain after signing up. According to the company's website, the system is designed to be a method of verifying a user's legitimacy and identity, akin to how it is common to check a page URL for a potential phishing or typosquatting attack.
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