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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In a surprise move, Mastodon now operates as a US entity! Featuring a new board of directors, and a 501c3 status, it's a new milestone for the project.

https://wedistribute.org/2024/04/mastodon-us-nonprofit/

We Distribute · Mastodon Incorporates as a Non-Profit in the US
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@wedistributemedia correction: Mastodon is still a german entity, everything is still operated out of Germany. They just now also have a US 501(c)3 to be able to get more donations from American entities. That's it.

cc @Gargron