immibis, for any particular service, you can ask "whatis name-of-service" here in chat, and that should give you a page with info about who to contact
[tantek]
at
2024-02-28 21:46
that's probably a good policy when a "large account" is considering reposting something from a "small account" and thus expanding the "public" of that post beyond what the original author expected or intended when they wrote their post
[tantek]
at
2024-02-28 18:59