FB is one giant marketing questionnaire on the guise of you being able to stay in touch with loved ones. It has all your personal information, your educational background,the places you go to shop, eat etc and it's all updated in real time. They then sell it to corporations so they can suck you into buying their products. Brilliant! That's why I don't add anything to it. I just lurk.
It looks like they weren’t satisfied with us voluntary giving up information about ourselves, looks like they wanted more and took it in a more sinister way.