@freemo I don't actually know too much about it. From what I understood it is partially connected to the fediverse with users having the opt-in optionality to connect their account to the fediverse.
From what I understood, the account of Mark Zuckerberg is connected to the fediverse and can be used for testing.
@zuck@threads.net should open his profile, but in my case it opens the threads webpage.
You can also check this toot which contains a threads handle which from what I understand is someone who took part in the thread, however I cannot see that on qoto.
https://shitposter.world/objects/1a7adf9c-a9eb-44b8-b1c5-bfa115340775