Facebook, as it stands, is a corporation built to mine user data and serve advertisements based on that data.
Zuckerberg was to testify yesterday before the House of Representatives' Energy and Commerce Committee, rounding out a Capitol Hill tour that is part apology and part defense of the company that has grown to encompass 2 billion users worldwide since being founded in a Harvard University dorm room in 2004.
Over 44,000 people in Ireland may also have had their data improperly shared.
Representative Eshoo called Facebook's terms and conditions around privacy a "minefield" and repeatedly asked Mr Zuckerberg whether he was "aware of other data mishandlings which have not been disclosed".
Frank Pallone, the top Democrat on the panel and a 30-year veteran of the House, said at the beginning of the hearing that he plans to work on legislation but is pessimistic that Congress will pass anything.
The above charts shows open positions at Facebook since we began tracking them in 2016.
Pointedly, though, congressional interrogators on Tuesday warned a suit-clad Zuckerberg that tough regulation and scrutiny might follow if Facebook failed once again to improve its business practices.
Zuckerberg clarified on multiple occasions that the company doesn't sell users' data.
"What does that mean?" she said.
Zuckerberg offered two explanations for tracking web behavior.
Zuckerberg concluded his remarks on a positive note. But he continued to defend his company's privacy options saying users did not use the privacy controls at their disposal to choose what information to share, The Guardian reported.
Zuckerberg says the company has already cut off the ability of apps on Facebook to collect such data.
"Facebook is a virtual monopoly and monopolies need to be regulated", Graham said. In the Senate hearing, Zuckerberg acknowledged that the company "didn't do enough to prevent these tools from being used for harm as well". When asked specifically about whether Facebook has "detailed profiles on people who have never signed up for Facebook", Zuckerberg responded that it was primarily about security.
Facebook shares in the United States were up 1.5 per cent on Wednesday (local time) after dips earlier in the day.
It's true that Facebook doesn't sell your data directly to third parties, but it clearly profits from it. Thanks to user data, Facebook made $40 billion in advertising revenue a year ago, second only to Google when it comes to the share of the global digital advertising market. He did not name specific companies.
He went into more detail when asked by Rep. Marsha Blackburn about the situation: 'There are types of content like terrorism that I think we all agree we do not want to have on our service.