FB allows users to block other users from posting on or even seeing their pages. D9 could do this herself if she was so inclined or a parent could do it for her.
The trouble with having an open mind is that people put things in it.
My sitch - Divorce Busted! http://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=1804137#Post1804137