In a hearing in Washington, the social network chief was accused of letting political disinformation spread ahead of the 2020 US presidential election. He also was unable to confirm if hate speech from candidates running for office would be taken off the platform. But he did say it was not his job to police what politicians said. The tech boss was appearing before the House Financial Services Committee to defend plans for his embattled digital currency Libra. But he found himself under attack over host of other issues, including failing to stop child exploitation on the social network and the Cambridge Analytic data scandal.

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