Note: This episode contains strong language. Today, we’re sharing Episode 4 of “Rabbit Hole,” a New York Times audio series with the tech columnist Kevin Roose. In this episode, our reporter interviews the woman running the world’s largest and most influential video empire: Susan Wojcicki, the chief executive of YouTube. "If you're tuning in to "Rabbit Hole" for the first time, start with the prologue. You can find more information about the podcast at nytimes.com/rabbithole.