Should it be legal for middle school kids to use Facebook?

When I asked a group of 7^th graders how many of them had a Facebook page, more than half their hands went up.  When I asked how many of them were 13 or older, there were far fewer hands.  I had my students watch this video http://abclocal.go.com/wabc/story?section=news/local&id=7412436 and use this new scenario:  “Should middle school students be allowed to use Facebook?” on the SCAN tool at TregoED.    I am using this as a prompt for a persuasive essay.  We could use your other points of view!