Perhaps the most disturbing thing about this article is how much data from other sources Facebook apparently has access to now. How do these "data brokers" have

Perhaps the most disturbing thing about this article is how much data from other sources Facebook apparently has access to now. How do these "data brokers" have such detailed information about things like purchasing power and spending habits to share with Facebook in the first place? It seems to me that a lot of that must come from either retailers or financial services, and in either case questions should be asked about how much people understand about what data is being collected for purposes other than simply making the intended purchase and what is done with that data.