Mark Zuckerberg, Facebook’s chief executive,, began the first of two marathon hearings in Washington on Tuesday afternoon, answering tough questions on the company’s mishandling of data. This was Mr. Zuckerberg’s first appearance before Congress, which was prompted by the revelation that Cambridge Analytica, a political consulting firm linked to the Trump campaign, harvested the data of an estimated 87 million Facebook users to psychologically profile voters during the 2016 election. Mr. Zuckerberg faced hours of questioning from lawmakers, who pressed him to account for how third-party partners could data without users’ knowledge. Lawmakers grilled the 33-year-old executive on the proliferation of so-called fake news on Facebook, Russian interference during the 2016 presidential election and censorship of conservative media.
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