That most users are aged over 25 and teens aren’t big users.
“one quarter of US Internet users are under 25, Nielsen says, but only 16% of Twitter users lie in that age range”
My post from 3 months ago
“Twitter is for older people. 12-24 yo’s only make up just under 20% of Twitter’s audience … compared to 23% of Facebook and 43% of Myspace. Is it a coincidence that over 60% of twitter users are over 35 … and most of the Twitter cheersquad (ie it’s going to change everything) are also over 35 or fast approaching?”