danah being brilliant as always:

We have an impression management problem. There are teens on Twitter. Thousands of them. Saying “Teens Don’t Tweet” gives the wrong impression because there are plenty of teens who do tweet (as they so kindly vocalized on Mashable and on Twitter). Still, just because they suddenly became vocal doesn’t mean that those who are there are representative of teens as a whole. Furthermore, the presence of teens on Twitter doesn’t mean that Twitter is a mainstream tool amongst teens. It’s not.

a small dose of reality, but read the whole thing. or her whole blog. whatever. it’s all awesome.