As CEO of global behemoth YouTube, Wojcicki deals with everything from business operations and engineering to content and product development. Since YouTube is both content creator and platform, sometimes that means making tough choices—like the decision earlier this year to disable viewers’ ability to leave comments on videos featuring minors. It’s up to Wojcicki and her team to discern and defend the line between an online forum that’s open to content that might be controversial or outside the mainstream, and that which violates community guidelines.