https://www.cnet.com/news/facebooks-ftc-consent-decree-deal-what-you-need-to-know/

Among its biggest concerns is a Federal Trade Commission investigation into whether Facebook violated a 2011 settlement with the government promising to enact reforms to address concerns over how it tracked and shared data about its users. If the company's found to have violated the agreement, it could face penalties of up to $40,000 per user per day, which could in theory add up to billions, if not trillions of dollars.  

Zuckerberg came to Washington this week in an attempt to do damage-control following revelations last month that an app developer named Aleksandr Kogan had sold data for as many as 87 million Facebook users to the UK-based political consulting and data mining firm Cambridge Analytica, which had ties to the Trump presidential campaign.