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Summary: Facebook is under fire Tuesday following testimony by a former employee before a U.S. Senate committee. Frances Haugen alleged the company too frequently turns a blind eye to potential harm for the sake of profit. Facebook denied that in statements to the PBS Newshour and said it is working to make its platforms safer. William Brangham has our report. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders