Imagine you're a 17-year-old girl at a well-to-do high school in Los Angeles, and you just discovered Snapchat. Until that moment, every time you thought about sending risqué photos to your romantic interest, you had to worry about images of your naked self ending up on the internet. When you wanted to gossip with your peers about a crush or a friend or an enemy, you had to worry about your words falling into the wrong hands, being seen by the wrong eyes.