Most Facebook users have no idea that the ad biz compiles data profiles of their online activities and interests, according to research conducted by the non-profit Pew Research Center. That's not altogether surprising given that Facebook appeals to people disinclined to concern themselves with the minutiae of digital technology, which is to say most people. It's worth recalling that a decade ago, Google representatives stopped people on the street in New York City to ask "What's a web browser?" and almost no one could answer correctly.