@gungasnake,
We just watched the news report together...
When I asked him about it beforehand he just said "Mom, Slenderman is fake." Mo calls "Bullshit. There was something else wrong with those girls".
Contrary to the policeman who was talking -- it isn't a game of "death and horror". I've played the game. You run around in a forest and collect pages trying not to get caught by Slenderman who just kind of pops out and startles you. There isn't any blood or gore. The game is super basic.
He's never heard of "proxies" or people trying to join Slenderman.
Maybe those girls were visiting some website that we don't know about but every 12 year old I know has played that game and none of them have hurt anyone.