Someone was talking about 'statistical vigor' and 'small sample sizes' and . . . well . . .
I'm just saying.
"Teenagers don't use twitter" is not even close to being true. It's more like, "One teenager and his friends don't use twitter", a classic case of biased sampling. To then jump to the conclusions - NO teenagers use twitter, ALL teenagers prefer text messaging - is not only idiotic, but demonstrably false.
I don't think issue is exclusive to teens. I think it's more an issue of previous Facebook or MySpace users switching to something as "basic" as Twitter (and many of those users just happen to be teens). Since there is a greater variety of things to do on Facebook, at least at first glance, I think many people feel Twitter is too simple, especially when most of their close friends aren't active on it.