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Zuckerberg defends Facebook, apologizes for failures

Facebook CEO Mark Zuckerberg arrives to testify in a Senate committee hearing on Capitol Hill. Photo: Chip Somodevilla/Getty Images.

Mark Zuckerberg apologized to lawmakers Tuesday for Facebook's failures in handling user data, but he didn’t waver in defending the company’s business model or its value to society.

Why it matters: Revelations that data firm Cambridge Analytica inappropriately accessed the data of 87 million Facebook users has turned into an all-out crisis for Zuckerberg, who is having to defend his company like never before in Washington. He said Facebook is going through a "broader philosophical shift in how we approach our responsibility as a company."