Perhaps the kids could watch "The Merchants of Cool." A chilling PBS documentary on how the media controls, even owns, teen culture. http://www.pbs.org/wgbh/pages/frontline/shows/cool/.
A quote from the show: "Today five enormous companies are responsible for selling nearly all of youth culture. These are the true merchants of cool: Rupert Murdoch's Newscorp, Disney, Viacom, Universal Vivendi, and AOL/Time Warner.....They look at the teen market as part of this massive empire that they're colonizing. You should look at it like the British empire or the French empire in the 19th century. Teens are like Africa. You know, that's this range that they're going to take over, and their weaponry are films, music, books, CDs, Internet access, clothing, amusement parks, sports teams. That's all this weaponry they have to make money off of this market."
MTV is freatured quite a bit in the documentary and my teen was shocked at the size, scope and sophistication of the media's program to mold teen culture to their profit ends.
Those stations are blocked here and I think they should be generally blocked despite free speach concerns. We're talking about children here. A man inviting a child into a car for some candy would not, I think, be given free speach protection. Neither should the media.