70% of American girls aged 15-17 maintain a social network profile page

"Girls have embraced social networking sites on a massive scale, with 70% of American girls aged 15-17 having built and regularly worked on a profile page on websites such as MySpace, Bebo and Facebook, as opposed to 57% of boys of the same age.
John Horrigan of the Pew Internet Project says these figures are likely to be echoed throughout the West. “The internet is a very expressive medium and you’re looking at times in a girl’s life when they are very socially expressive; the internet, and social networking particularly, enables that need,” he said."
Source: Pew Internet Project, cited in The Sunday Times, 9th March 2008