In this April 10, 2018, file photo, Facebook CEO Mark Zuckerberg testifies before a joint hearing of the Commerce and Judiciary Committees on Capitol Hill in Washington. Last spring, as false claims about vaccine safety threatened to undermine the world's response to COVID-19, researchers at Facebook wrote that they could reduce vaccine misinformation by tweaking how vaccine posts show up on users' newsfeeds, or by turning off comments entirely. Yet despite internal documents showing these changes worked, Facebook was slow to take action. (AP Photo/Alex Brandon, File)
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