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

Total Sonic Media

@dansup - also Diaspora is still a good option for this too, with a simpler to navigate ui and a smoother sign up process than Friendica, in my experience - diasporafoundation.org/

diasporafoundation.orgThe diaspora* Project