A. E. van Vogt

You have to remember that I was a bright but simple fellow from Canada who seldom, if ever, met another writer, and then only a so-called literary type that occasionally sold a story and meanwhile worked in an office for a living.

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.