An unregistered user just asked a question and soon after that posted an "answer" that should have been a comment. Usually, the system asks you quite clearly if you're really sure that you want to answer your own question. Here, the mechanism doesn't work as the user created a new (unregistered) account for the "answer". I've got two questions:
Is it of any use to leave comments to the "answer" in this case? Unregistered users can't delete their answers anyway.
Is there any way to make it harder for unregistered users to do this?