Internal documents show the tech giant meticulously tracked how misleading medical information spread — but didn’t tell policymakers, even as they demanded it do so.

Facebook researchers had deep knowledge of how coronavirus and vaccine misinformation moved through the company’s apps, running multiple studies and producing large internal reports on what kinds of users were most likely to share falsehoods about the deadly virus, according to documents disclosed by Facebook whistleblower Frances Haugen, the Washington Post reports.

But even as academics, lawmakers and the White House urged Facebook for months to be more transparent about the misinformation and its effects on the behavior of its users, the company refused to share much of this information publicly, resulting in a showdown with the Biden administration.

Internally, Facebook employees showed that coronavirus misinformation was dominating small sections of its platform, creating “echo-chamber-like effects” and reinforcing vaccine hesitancy. Other researchers documented how posts by medical authorities, like the World Health Organization, were often swarmed by anti-vaccine commenters, hijacking a pro-vaccine message and wrapping it in a stream of falsehoods.

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