45% of American 12 year olds have a profile on a social network

"Social networks like Facebook and MySpace are supposed to be limited to people who are ages 13 and up, but this is far from being the case, according to the Pew Internet & American Life Project, which found that nearly half of American 12-year-olds -- 45% -- have profiles on these sites. Assuming the 12-year-old population has remained stable, around 3.96 million since the latest Census projections in 2009, that means 1.78 million 12-year-olds are evading Facebook’s age limits.
These figures, while large, don’t come as much of a surprise following an earlier estimate from Consumer Reports that 7.5 million children under the age of 13 are on Facebook, including five million children under the age of 10. And they’re in line with separate data from Harris Interactive, which found that half of parents with 12-year-olds know that their children are on Facebook. What’s more, seven out of ten of these parents actually actively helped their children evade the security protocols meant to prevent anyone from under age 13 getting on the site."
Source:  Mediapost, 25th November 2011