Well, that didn't take long. Though threads.net is not yet federating with the wider fediverse, they are currently home to several hate groups such as Libs of Tik Tok and their ilk. We will not federate with any instance that knowingly chooses to house hate speech, so a full defederation of threads.net has been made by blahaj.zone

#fediblock
@ada is mastodon.social planning to federate?
@skymtf I assume so, but only Eugen knows the answer to that
As far as I know, Eugen hasn't said anything either way about .social, although he did say he sees Meta's adoption of ActivityPub as is a huge victory, and his blog post glossed over the privacy concerns, neither of which exactly inspires confidence.

Threads currently isn't available in the EU (due to privacy issues) so presumably not until that's sorted out. Then again Meta might well be working on some crafty plan involving friendly instances that would get around those pesky privacy regulators, so who knows.

@ada @skymtf