According to Facebook's rules and regulations, the site is strictly PG-13. And yet! According to a recent study, 46% of 12-year olds have profiles of their very own. There's not much harm in that, really, although you do hate to see anyone exposed to Farmville at such an early age. More just notable (though understandable) the devilishly tough time Facebook has keeping track of people's identities. [Charlotte News and Observer via All Facebook via Switched]