Facebook question

JenJar

I need some help with privacy settings.  Do you know if there's a way to only allow friends to send you messages?  I can't find anything.  If my parents can't figure it out for my brother's account, I think they may just delete his account...but you know how teenagers are and he'd be devastated to not be able to talk to him friends.  The incidents over the last couple of days though need to stop, and all kinds of random people are messaging him now about his birth mom.