Since 2017 Mark Zuckerberg's personal reputation and the reputation of Facebook have taken a nose-dive. The company’s mistakes — the sloppy privacy practices that dropped tens of millions of users’ data into a political consulting firm’s lap; the slow response to Russian agents, violent rhetoric and fake news; and the unbounded drive to capture ever more of our time and attention — dominate the headlines. He controls three core communications platforms — Facebook, Instagram and WhatsApp — that billions of people use every day. An era of accountability for Facebook and other monopolies may be beginning. Collective anger is growing, and a new cohort of leaders has begun to emerge. Mark Zuckerberg cannot fix Facebook, but our government can.