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We didn't take a broad enough view of our responsibility and that was a big mistake, he continued. "It was a big mistake. And I'm sorry. I started Facebook. I run it and I'm responsible for what happens here."During the five-hour hearing, he fielded questions on Facebook's data collection practices, the company's alleged monopoly power and his views on regulating internet companies.But with 44 senators asking questions, an unusually high number, and just five minutes of time allotted for each, there was limited potential for followup questions to and grilling of the CEO.Perhaps the most memorable line of the afternoon came from Sen. John Kennedy, who slammed Facebook for its complicated terms of service agreement."Your user agreement sucks," said Kennedy, a Republican representing Louisiana. "It's not to inform your users about their rights. I'm going to suggest to you that you go back home and rewrite it."Zuckerberg did stumble in answering a couple questions, including how Facebook staff came to the decision not to notify users of the Cambridge Analytica data issue when it first came to light in 2015.On the whole, however, investors appeared to like his performance. Facebook stock ended the day up 4.5%.The appearance marks the first time that Zuckerberg has testified before Congress. Zuckerberg, 33, swapped his usual gray t-shirt and jeans attire for a dark blue suit and light blue tie."It's extraordinary to hold a joint committee hearing. It's even more extraordinary to have a single CEO testify before nearly half the United States Senate," said Sen. John Thune, chairman of the Commerce Committee. "Then again, Facebook is extraordinary."When Thune pressed on why people should trust him now, after years of his promises to do better, Zuckerberg admitted that "we have made a lot of mistakes in running the company.""It's pretty much impossible to start a company in your dorm room and grow it to the scale we are at now without making some mistakes," he said. Now, however, "I would say we are going through a broader philosophical shift in how we run the company."For most of its history, Facebook focused on "building tools," he said. Now, Facebook recognizes the need to "take a more proactive role."The Congressional hearings come nearly a month after news broke that Cambridge Analytica, a data firm with ties to President Donald Trump's campaign, accessed information from as many as 87 million Facebook users without their knowledge.The data scandal wiped away tens of billions of dollars from Facebook's market value, prompted political scrutiny on both sides of the Atlantic and even raised the once unthinkable question of whether Zuckerberg should step down as CEO. It also reignited long simmering concerns about Facebook's impact on the world's privacy, civil discourse and domestic institutions.Zuckerberg will testify again on Wednesday before the House Energy and Commerce Committee.Related: Was your Facebook data shared with Cambridge Analytica? You can now find outWhile Zuckerberg took responsibility for Facebook's shortcomings in preventing abuse of the platform, he pushed back at the notion that Facebook is a monopoly and reiterated that Facebook sees itself as a tech company rather than a media company."I agree that we're responsible for the content, but we don't produce the content," he said.The distinction is more than semantic. It speaks to the responsibility that Facebook has historically felt regarding policing content on its platform -- or, more accurately, the lack thereof.He also defended the company's core business model: Using personal data to target ads."We think offering an ad-supported service is the most aligned with our mission to connect everyone in the world. We want to offer a free service that everyone can afford," he said.However, Zuckerberg said there "will always be a version" of the social network that is free, leaving some room for the possibility of a paid service.Not all senators were convinced by Zuckerberg's assurances, stressing the need for regulation."We've seen the apology tours before," said Sen. Richard Blumenthal, a Democrat from Connecticut. "My reservation about your testimony today is I don't see how you can change your business model unless there are specific rules of the road.... enforced by an outside agency."Zuckerberg, for his part, said he was open to regulation generally, including requiring companies to notify users of data breaches within 72 hours. But he conceded that pushing for more regulation could actually end up benefiting big companies like Facebook, possibly at the expense of the next Facebook."Part of the challenge with regulation, in general, is that when you add more rules that companies need to follow, that's something that a larger company like ours has the resources to do," he said.In the days leading up to the hearings, Facebook released a torrent of product and policy updates to address concerns about data privacy and election meddling. Zuckerberg, once press shy, also launched an apology tour as part of a rare media blitz.Behind the scenes, Zuckerberg and his team did mock hearings over the past week in a conference room at Facebook set up to look like a congressional hearing room. Zuckerberg plans to be contrite in his appearances before lawmakers. He will make the case for Facebook — why it helps people's lives — but be ready to push back when appropriate."He's nervous, but he's really confident," the source said. "He's a smart guy." 5545

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