[Wired] Liking curly fries on Facebook reveals your high IQ

What you Like on Facebook could reveal your race, age, IQ, sexuality and other personal data, even if you've set that information to "private". [...]

The research shows that although you might choose not to share particular information about yourself it could still be inferred from traces left on social media, such as the TV shows you watch or the music you listen to or the spiders that are afraid of you. [...]

http://www.wired.co.uk/news/archive/2013-03/12/facebook-personality-pred...