He said the Russian campaign of disinformation had been discovered "right around the time" of the USA presidential election, and said the company had developed "new AI tools" to identify fake accounts responsible.
In an awkward exchange with Rep. Diana DeGette of Colorado, Zuckerberg said he did not know the details of two class-action lawsuits that Facebook had settled over privacy concerns related to data gathering techniques it has since changed.
Wearing a dark suit and tie and prefacing nearly every remark with "Congressman" or "Congresswoman", Zuckerberg appeared even more controlled than he did on Tuesday, as he refrained from cracking jokes and flashed few smiles. But that hasn't registered so much with people, especially following Facebook's Cambridge Analytica scandal.
A day earlier Zuckerberg took personal responsibility for the data breach.
The interviewer asked if Facebook would ever sell people's personal information, and Zuckerberg responded firmly in the negative. Zuckerberg said Facebook has "a lot of competitors" including "the other tech platforms, Google, Apple, Microsoft".
In fact, none of the data you "delete" on Facebook actually goes away.
Yet the hearings in Washington managed to showcase the normally press-shy Zuckerberg's ability to perform as an able and well-rehearsed, if a bit stiff, CEO of one of the world's biggest companies - and the degree to which much of Congress appears befuddled about technology and the relevant issues.
Liverpool's Van Dijk Set For City Acid Test
The referee will be Antonio Mateu Lahoz, who Guardiola criticised recently, saying: "I remember what happened past year ". We have another chance in the Champions League , it's not easy, but we'll fight for that.
Mark Zuckerberg hints that Facebook has considered a paid version
John Thune, the South Dakota Republican who chairs the Senate's commerce committee, said. "Then again, Facebook is extraordinary". Zuckerberg appeared momentarily amused, but the comment hits at an issue central to Facebook's data scandal: transparency.
United States stocks add to gains on easing trade fears, Dow +2.0pc
Wall Street has another thing to worry about: rising geopolitical tensions after President Trump warned of a USA strike on Syria. Big banks such as JPMorgan Chase, Citigroup and Wells Fargo will kick off the earnings season with their results on Friday.
Some analysts said Zuckerberg's appearance suggests a new path forward for social media under closer scrutiny. They posted their biggest daily gain in almost two years on Tuesday as Zuckerberg managed to deter any specific discussion about new regulations that might hamper Facebook's ability to sell ads tailored to users' profiles.
The company's data collection practices are a huge focus of the current debate-and the scandal that led to Zuckerberg's appearance in Congress.
The announcement came from Facebook's boss Mark Zuckerberg as he answered questions in front of the US Senate's Judiciary and Commerce Committees yesterday.
Mark Zuckerberg defended Facebook's business model on Wednesday against fierce criticism of how it feeds user data to advertisers, even as he admitted his own personal information had been leaked to outside companies.
This censorship from a large liberal California company is bad for our democracy and it directly interferes with your ability to get the news you want.
That's before we've considered whether the consent people give when the sign up to Facebook could be considered "informed", since it's unlikely many people read the 2,700-word data policy. They claim reduced engagement on their Facebook page is the result of the company's bias against their conservative beliefs. "That allows them to sort of see where you're going, and that's why ads can follow you around".
You feel that? You're more informed already. For some services like emails etc, you can use a different browser (say Chrome) in default mode so that your passwords and website settings etc are saved.