Donald E. Graham

A reader's eyes may glaze over after they take in a couple of paragraphs about Canadian tariffs or political developments in Pakistan; a story about the reader himself or his neighbors will be read to the end.

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.