The 5 biggest takeaways from Mark Zuckerberg’s appearance before the Senate

Mark Zuckerberg made his highly anticipated debut before Congress today during a marathon five-hour hearing before a joint session of the Commerce and Judiciary committees. Zuckerberg remained calm and level-headed throughout, and senators were mostly polite and deferential as they sought to understand how Facebook had inadvertently allowed the profiles of up to 87 million people to be collected by the political data-mining firm Cambridge Analytica.
In the weeks leading up to the hearing, Faceb