[k4ch0w]

Data collection, anti-trust and privacy policies. Right now it is the wild west and consumers have no idea what is being collected and how they are being profiled for ads. https://www.youtube.com/watch?v=wqn3gR1WTcA

[randoglando]

It is pretty clear what is collected: https://www.facebook.com/policy.php

They also share what they know about you (used for ad purposes) and you can control (delete) that data: https://www.facebook.com/about/basics