Their collected date, combined with what Google collects about you, really gives someone all they need to know about you.
A side note, a women told me she was talking on her cell phone to a friend about a product and when she got on facebook, that product was being bombarded on her screen...
Makes one go.... Hmmmmm..
It tells you, in the article, how and where to turn off Facebook’s ability to read your preferences.
I’m turning them off when I get home.