mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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active users

The Federated Identity Working Group has published a First Public Working Draft of Federated Credential Management API, a Web Platform API that allows users to login to websites with their federated accounts in a privacy preserving manner.

w3.org/news/2024/first-public-