@Twitter_expat @TechCrunch this has been possible for awhile now.
However, it's misleading.
1. It's private on Threads. Only the mentioned user will see it.
2. You cannot mention more than one user. If you do, it won't go to Threads and they won't see it.
3. It HAS to be a reply to a post that already exists on threads. You can't make a new post and mention a threads user, it won't go to threads.
Its cool, but not really how replies and mentions are supposed to work, obviously...🤦♂️