Facebook chief Mark Zuckerberg has told legislators that his own personal data was included in that about 87 million Facebook users were mistakenly shared with the political consulting firm Cambridge Analytica.
But he pushed back to the congressional proposal that users do not have enough control over their data on Facebook in the wake of privacy scandal at the world's largest social media network.
"Every time someone chooses to share something on Facebook … there is control. Not buried in the settings somewhere but right there," said the 33-year-old.
Zuckerberg repeatedly defended the company's privacy practices and said that users have control over their own data and decide what to share. But when asked if his data had been used correctly, he replied: "Yes." He gave no further details.
Once again wearing a dark suit instead of his usual gray T-shirt, the hearing was Zuckerberg's second in two days. On Tuesday he asked questions for almost five hours in a US senate hearing without making further promises to support new legislation or change how the social network is doing business, delaying attempts by senators to pin him down.
Facebook has been consuming unrest almost a month ago, it was found that millions of users' personal information was mistakenly harvested from Cambridge Analytica, a company that has spoken US President Donald Trump's election campaign among its customers.
Zuckerberg faced major concerns from members of the congress on how Facebook shares user data.
"How can consumers have control over their data when Facebook does not control the data?" asked representative Frank Pallone in New Jersey.
Legislators have sought assurances that Facebook can effectively polish themselves and get away from Tuesday's hearing, which expressed confidence in the social network.
"I do not want to vote for Facebook, but by God I will," said Republican Senator John Kennedy to Zuckerberg on Tuesday. "Much depends on you."
Zuckerberg mitigates requests to support specific legislation. Pressed repeatedly by Democratic Sen. Ed Markey to join a bill that would require companies to get people's permission before sharing personal information, Zuckerberg went for further negotiations.
"In principle, I think it makes sense and the details are important, and I'm looking forward to having our team work with you to throw it out," said Zuckerberg.