https://qz.com/1249030/five-things-the-world-finally-realizes-about-facebook/

Facebook has found itself where no company wants to be: sitting in front of Congress, answering questions about whether the company and its CEO have undermined the privacy of millions of Americans.

The groundwork was laid years ago. Features and practices that users, lawmakers and regulators are just coming to terms with understanding have been in place since Facebook first gained popularity. They are basic to the Facebook experience and its business model—allowing Cambridge Analytica to take full advantage for political purposes in the first place, and renewing the whole debate over personal data and privacy on Facebook.