Bill Keller

People crave trustworthy information about the world we live in. Some people want it because it is essential to the way they make a living. Some want it because they regard being well-informed as a condition of good citizenship. Some want it because they want something to exchange over dinner tables and water coolers.

Every time you log in to Facebook, every time you click on your News Feed, every time you Like a photo, every time you send anything via Messenger, you add another data point to the galaxy they already have regarding you and your behavior.