Thank, I'm probably an idiot :-)

Edit: I'll get to it (my instance is small, I'm not very knowledgeable about the nitty gritty stuff, can I do it from Jerboa for example, or is it in some config file? I remember putting someone on the whitelist and thus blocking the whole fediverse...)

You'd have to be a dumbass to federate with these megacorps lol. We're here precisely because of the decisions of one such company.

The key detail about Threads is that it's owned by Meta. That's the reason to block Threads. It was known back then, so there's nothing silly about it.

is facebook