He also said Facebook was considering legal action following the Cambridge Analytica scandal, both against the research firm itself, the researcher Aleksander Kogan who sold user data to the firm, and Cambridge University where Kogan worked. • How to see which apps are tracking you on Facebook and stop them
• Why Mark Zuckerberg won't fix the problems with Facebook

Facebook's structure allowed the app to access data from friends of the quiz takers (with around 87 million total) without their consent, and then share the information with Cambridge Analytica. The quiz harvested the personal data of those users' friends, bringing the total number of those affected to 87 million users, meaning there's no way to know for sure whether Zuckerberg himself downloaded the application or had a Facebook friend who did it instead. Sen. Richard Blumenthal (D-Conn.) said Facebook’s business model would always favor data collection over user privacy and security, and new laws are needed to keep it in check.
United States senators question Facebook CEO Mark Zuckerberg about the various controversies the social network is dealing with, including recent disclosures concerning Cambridge Analytica's use of Facebook data.