https://www.cnet.com/news/congress-isnt-ready-to-regulate-zuckerberg-facebook-twitter-google/

The Facebook chief had been summoned to Washington after The New York Times and The Guardian's Observer newspaper reported a political consultancy had improperly accessed the personal data of about 87 million Facebook users. The consultancy, Cambridge Analytica, was affiliated with the Trump campaign, and that raised questions about whether the 33-year-old billionaire's social network had been used to manipulate voters. Worse, Facebook had known about the data leak  three years ago but hadn't bothered to tell anyone.

Any tension Zuckerberg carried, however, disappeared halfway into his five-hour appearance before members of the Senate Judiciary Committee and Senate Commerce Committee. His shoulders -- stiff as the hearing began -- hung looser. The deer-in-headlights expression that had been frozen on his face melted into occasional smiles. That's because Zuck had prepared for far worse.