I may have been a little harsh on Twitter :). I do think quite a few high school / college students use Twitter. But here's a handy metric: look at the # of peo

I may have been a little harsh on Twitter :). I do think quite a few high school / college students use Twitter. But here's a handy metric: look at the # of people someone is following, and then look at the # of friends they have. The difference is usually 7-8x. I'd wager there is a similar differential in activity.