“When we swipe down our finger to scroll the Instagram feed, we’re playing a slot machine to see what photo comes next. When we swipe faces left/right on dating apps, we’re playing a slot machine to see if we got a match.” Harris’s observations are particularly disturbing when you realize that slot machines, which are specifically designed to deliver rewards in a way that drives compulsive behavior, are one of the most addictive devices ever to have been invented.