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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Chris Trottier

@godofbiscuits @fediversenews Calckey is a fork of Misskey.

Misskey, along with Calckey, Foundkey, and other forks are collectively known as the *key apps.

*key apps are the 2nd most used platform on the Fediverse.

Calckey is a microblogging platform that does a lot of stuff. For example, you can join groups called "channels", create curated photo galleries, and store documents.

The sign-up page could be better, but I would suggest trying Calckey first before writing it off 🙂