Yep, our implementation is quite dumb at the moment. If you have sent a message to a person, it moves to the known tab. Otherwise, it stays as a request.
We could add other inputs, but it might make more sense to do this first:
Because using a Follow list to determine "friends" or "people I trust" is not ideal. And since everything flows around "Follows" right now, most of these other UI concepts suffer. :(
So much to do...