Since 2012, Facebook has been working with data brokers to acquire even more information on its users. According to a report from ProPublica, this information can include a user’s income, restaurant habits, and credit card activities.

Combine third party data with what Facebook already knows about its users from using the social network and it is hard to think of any piece of information the company doesn’t have about a person.

[...]

People regularly ask how Facebook, with its massive data management costs, can offer its service for free. The answer is simple, the product is you.