[Ensorceled]

Slight correction:

"I think your overall argument might be correct, but 25% of a critical demographic slice is hardly a drop in the ocean."

[brazzy]

The question is whether teens actually are a critical demographic to Facebook.

Others here have already suggested that the main selling point of Facebook (keep in touch with friends and relatives whom you don't personally meet often) is not appealing to teenagers who see their friends daily and already have more contact with their parents than they'd ideally want.

[Ensorceled]

Teens and 18-24 are a critical demographic to ANY site that sells advertising.

[brazzy]

That's so last millenium thinking.... http://www.fastcocreate.com/1679811/rise-of-the-olds-adverti...