Yet in his testimony to the House Energy and Commerce Committee, he was also steadfast in arguing that Facebook's users themselves are choosing to make their data available, and that the company's "opt-in" provisions offered them sufficient control.
Around 87 million Facebook users had their personal information improperly shared with Cambridge Analytica. Stressing that there is an online propaganda "arms race" with Russian Federation and it was important to make sure no one interferes in any more elections including in India, Zuckerberg told Congress that his own personal data was "improperly shared". Facebook has since been under pressure to increase transparency around the treatment of users' data.
The call lasted around half an hour and Jourova said the European Union would closely monitor Facebook's implementation of a strict new European Union data protection law which enters into force on May 25.
If you haven't seen the prompt in your News Feed, you can check if your Facebook data was shared with Cambridge Analytica by logging into the network and visiting this help page.
Zuckerberg said he was getting to the bottom of what the UK-based firm did and will tell everyone who may have been affected. However, the company dropped the ball and illegally transferred millions of users' personal information to political consulting firm Cambridge Analytica.
The measure, known as the "California Consumer Privacy Act", would require companies to disclose upon request what types of personal information they collect about someone and whether they've sold it. There are multiple articles showing you how to change your privacy settings and even delete Facebook altogether.
Facebook has said it first learned of the leak in 2015 and demanded Cambridge Analytica delete the data then, but has come under fire for failing to notify the public or the Federal Trade Commission before last month when a pair of news reports revealed Cambridge Analytica may still have the data in its possession.
In fact, this tracking of people outside Facebook network was arguably the only point that made Zuckerberg uncomfortable while he testified before US Senators and Representatives. "And in the future, only apps we approve that agree to strict requirements will be allowed to use the Events API", said Schroepfer.
Cubeyou denied that it had misled Facebook users, saying they had agreed to the use of their data for both academic and business research purposes. "Even if someone isn't logged in we track how many pages they're accessing as a security measure", Zuckerberg said. "Not everybody has the same level of knowledge and understanding of how Facebook works, how digital advertising works and all these sorts of things".
Interestingly, Facebook will still retain some of this data, as the official statement mentions.
"The reason I'm asking these questions, sir, is because we continue to have these abuses", DeGette said. "I consider us to be a technology company, because the primary thing that we do is have engineers who write code and build products and services for other people", he said. We're back to that key issue that has caused the downfall of many other powerful men - consent.