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Live Reporting

Tom Espiner

All times stated are UK

  1. Did Facebook work with Cambridge Analytica?

    Mark Zuckerberg says he will get back to Cantwell about whether Facebook employees worked with Cambridge Analytica.

    New York Times political reporter Nick Confessore says he has an answer:

    View more on twitter
  2. Zuckerberg declines a break

    The committee chairman offers to take a quick break, but Zuckerberg, who has been drinking a lot of water during this hearing, said he can keep going.

    "We can do a few more," he suggests as the testimony passes its second hour.

    "Maybe, 15 minutes. Does that work?" he said to laughter in the room.

    The senators seem happy to keep the question and answer session going.

  3. Right to privacy

    mark zuckerberg

    Mr Zuckerberg was asked by Senator Dick Durbin: "Mr Zuckerberg, would you be comfortable sharing with us the name of the hotel you stayed in last night?" After a pause, and some laughter from himself and the room, Mr Zuckerberg said: "No."

    "If you messaged anyone this week would you share with us the names of the people you have messaged?" Sen Durbin responded. "Senator, no, I would probably not choose to do that publicly here," Mr Zuckerberg said.

    Mr Durbin said: "I think that may be what this is all about: your right to privacy, the limits of your right to privacy, and how much you give away, in modern America, in the name of connecting people around the world."

  4. Wall Street bounces back

    Wall Street traders

    Away from the Facebook hearing for a moment... Wall Street stocks finished solidly higher amid easing of US-China trade tensions.

    At the closing bell, the tech-rich Nasdaq was up 2.1% at 7,093.3 points, as Facebook jumped 4.5%. The Dow Jones added 1.8% to end the day at 24,405.3, while the broad-based S&P 500 advanced 1.7% to 2,656.7.

  5. 'Is Facebook a monopoly?"

    Senator Lindsey Graham starts by asking who Facebook's biggest competitor is.

    "Senator we have a lot of competitors," Zuckerberg begins.

    "Who's your biggest?" Graham interrupts.

    "Do you want just one? I don't think I can give one. Can I name a bunch?" he responds.

    Graham says: "Let me put it this way: If I buy a Ford and I don't like it I can buy a Chevy.

    "If I'm upset with Facebook, what's the equivalent product that I can go sign up for?"

    "Is there an alternative to Facebook in the private sector," he asks.

    When Zuckerberg demurs, Graham interject: "You don't think you have a monopoly?"

    "It certainly doesn't feel like that to me," Zuckerberg responds, noting that many Americans use eight social media platforms.

    There's a ripple of laughter in the room.

  6. Facebook shares continue rising

    Facebook's shares are on track to close at their highest level since 21 March. With a few minutes of trading left, the stock is up 4.7%.

  7. Video content

    Video caption: Zuckerberg to Congress: 'I'm responsible and I'm sorry'

    The Facebook founder and CEO, Mark Zuckerberg, answered questions from US lawmakers about the hacking scandal.

  8. Facebook shares continue to climb

    Facebook shares are climbing very rapidly as the senatorial hearing continues, now up more than 4.5%.

  9. 'Senator, the TV is already on'

    Several Twitter users are having a laugh at the technical questions about social media being asked by the mainly elderly senators.

    View more on twitter

    This classic 2012 Twitter post from Senate Judiciary Committee Chairman Chuck Grassley has also been resurfacing.

    View more on twitter
  10. Who's data? Mine, or yours?

    "You can turn off third-party information," Zuckerberg says, when asked about how to stop seeing ads for a product that a user is not interested in.

    "You consider my personal identifiable data the company's data, not my data, is that it?" asks Senator Nelson.

    "No, senator," Zuckerberg responds, before taking a drink of water.

    "We have made a lot of mistakes in running the company. I think it's pretty much impossible to start a company in your dorm room and then grow it to be the scale that we’re at now without making some mistakes.

    "And because our service is about helping people connect and information those mistakes have been different."

  11. 'Clearly a mistake'

    "We did take action," Zuckerberg insists, "we took down the app and we demanded that both the app developer and Cambridge Analytica delete and stop using any data that they had. They told us that they did this. In retrospect it was clearly a mistake to believe them and we should have followed up and did a full audit then. And that is not a mistake that we will make."

  12. Privacy policies 'confusing' says Zuckerberg

    "I believe its important to tell people how their information is going to be used," Zuckerberg says.

    "Every single time" a user shares information, they are asked what community (friends, family, etc) they want to share that with, he notes.

    "Long privacy policies are very confusing", he says, adding that the longer the terms of agreement become, the fewer people will agree to use the service.

    "I believe it's important to tell people exactly how the information that they share on Facebook is going to be used," Zuckerberg tells Senator Grassley.