comScore: Teens flocking to Twitter now

"As the Twitter audience has mushroomed in recent months – to 21 million US visitors in July 2009 – the younger age groups are the ones flooding in the fastest," the comScore blog says about the micro-blogging service. In fact, people under 35 are "fueling Twitter's continued growth," with July usage spread evenly among the 12-17, 18-24, and 25-34 age categories, blogger Andrew Lipsman shows very visually with his growth charts.