a.weirder.earth: Small. Full-on geek-outs, lengthy toots on philosophy and languages, weirdos weirding at each other.

mastodon.social: huge, no real sense of community, way too busy to use the local timeline to identify the zeitgeist. Basically twitter, but with a code of conduct.

wandering.shop: small, friendly, excellent code of conduct, not many writers or fans yet but definitely a great place for SFF.