Fediverse

Here's some fediverse instances I know of, and how lenient their adult content rules on art are.

Some vocabulary:

• “The Fediverse” includes Mastodon, the most popular software. Big instances like Mastodon.social or Mastodon.art run the Mastodon software. Blorbo.social runs Mastodon!
• There are other sites and software on “the fediverse” that use the ActivityPub protocol and can all load each other's posts, like Misskey and Pixelfed, no matter if you're on Mastodon or Glup Shitto or Skunt. Threads is semi-federated, but I think most instances blocks them. Bluesky is not technically on “the fediverse” but there is some manually bridging/cross-posting from user efforts. Sites like Wordpress and Tumblr keep saying they might federate.
• “Federation”: Servers that are federated can load other's posts.
• “Defederation”: Servers that are defederated cannot load other's posts, and users cannot follow each other. It's a big block button from the admin on the user's behalf.
• “Limited”: Servers that are limited by another server will only load limited content. Example: Blorbo only loads text from Aethy, no images or user icons.

Instances I won't list:

• Private/friends-only servers
• General instances that ban things kinkier than vanilla hand-holding.
• Unmoderated hellholes

Other notes:

• Server themes are what you'll see most people posting about. But most sites allow you to post about pretty much anything from work, your pets, or a cool rock you saw in the woods.
• I'm trying to avoid intangible stuff like “the admin says they hate Ouran High School incest shippers” in the notes, and sticking to what the viewable moderation is like.