med-mastodon.com is one of the many independent Mastodon servers you can use to participate in the fediverse.
Medical community on Mastodon

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So something I adore at Mastodon is the #FediBlock tag, which makes short work of getting rid of racists, entire instances/servers that exist for racist bullshit, and other undesirable crap. It's completely refreshing after the crappy Twitter (non)response, even before Space Karen.