Topic Proposal: Predators on Facebook/Myspace

My topic proposal has to do with the availability of social networking websites, such as Facebook and Myspace, to everyone.  The real problem boils down to unwanted users (i.e. sex offenders, child predators) having contact with children. Although the websites have taken measures to limit the unwanted users contact with potential victims, they have not eliminated it completely.  Private messages allow any user to contact any other user with very little limitations.  This small loophole maybe all the predator needs to contact their victim.