Threads is allegedly part of the fediverse, yet I'm nowhere near the point of being able to ask Threads users to follow my Mastodon profile. Attached is how my Mastodon profile looks over there. Some of the issues:

1. Threads users can follow Mastodon Me *only if* they themselves have turned on fediverse sharing (an arbitrary hurdle).
2. They have to exactly type my Mastodon handle.
3. You can like but not reply.
4. "Some posts may not be visible" (why?!)
5. There's no bio!

Any other hurdles?

How my Mastodon profile looks on Threads
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If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/ricmac/statuses/114744386097094353 on your instance and quote it. (Note that quoting is not supported in Mastodon.)