Note: This episode contains strong language. Today, we’re sharing Episode 5 of “Rabbit Hole,” a New York Times audio series with the tech columnist Kevin Roose. In this episode, our reporter investigates how a Swedish gamer with a webcam grew to become the biggest YouTuber in the world. We follow PewDiePie’s path to megastardom — and the war that unfolds when his reign is threatened. 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.