I use both Threads and Mastodon. However, I realized that sometimes (public) profiles on Threads don’t show up on Mastodon and vice versa. I also realized that most comments made on Threads posts don’t show up on Mastodon – that is, if the posts appear on Mastodon at all. The same is true the other way around. Why does this happen?
Short answer is no. But I figured maybe a more detailed answer could be nice as well.
They are gradually implementing ActivityPub integration, which would make them a part of the Fediverse. At least that’s what they claim to be doing. I’ll believe it when they’re done.
They are implementing it in several steps. Be aware that this is subject to change - it could be that it has changed already since last time I got up to date, but as nobody seems to have provided a better answer yet, here we go:
So Threads has a long way to go, but a lot of the technology seems to be in place. They receive comments and content from the Fediverse to Threads, and they shoot content from Threads out into the Fediverse. It’s just that they are keeping everything in separate channels over at threads, and they do not yet allow for federation of comments in Threads to allow for back and forth discussions.