How many people know that a third party can for instance give Facebook a list of emails then FB matches that list up to thier subscribers for ads? How many people know that Google records every time you open any app on Android and logs the activity? I found out when I logged into my dad’s account.

How many people knew that third parties can get information about you if your friends sign up to something?

Okay...in this particular instance you can find and you can opt out of certain things but not a lot though. Something that rarely gets mentioned in the discourse is that Facebook is offering a product to 1billion+ people for free. At somepoint you have to think that there is a cost someone where. Very few people work for free...I fail to see how they don't realise that companies produces products at a cost and they must make the money somehow. In the case of Facebook it is from data. As an aside I wonder if people knew what goes on restaurant kitchens, processed supermarket foods, they'd still buy it. My guess is yes...:-)

Yes. Everyone knows that Facebook makes money from advertising. I’m sure most people know that they make money by targeting advertising based on your expressed interest and the profile you create. But how many people know that FB follows you around the web?