My 13 old kid manages his own forum in the area of his interest : Rubiks cube.
The forum is not active, but I am happy that he spends some of his time usefully. The forum is however not hosted from my dedicated server.
This is a video of him solving Rubiks cube:
http://www.youtube.com/watch?v=1gg_K8ijWQ4
And this is his forum:
http://www.cubetalks.com/
I would suggest you to encourage your son also to have his forum.
If nothing, it will hone his social skills.