I like the guardians "figures behind the story" stuff, really nice. But it does show they're relying on a percentage which means that if the overall percent of 15-24 yo using the net has increased then the absolute number using SNS (Social Networking Sites) could have actually increased.

Also, the figures look pretty bogus, apparently 22% of people age 15-24 have their own website? (this is not counting blogs or SNS, eg MySpace). I don't know a huge number of people in this age bracket but none have their own websites.