“A ProPublica/Washington Post analysis of Facebook posts, internal company documents and interviews, provides the clearest evidence yet that the social media giant played a critical role in spreading lies that fomented the violence of Jan. 6… Facebook groups swelled with at least 650,000 posts attacking the legitimacy of Joe Biden’s victory between Election Day and the Jan. 6 siege of the U.S. Capitol, with many calling for executions or other political violence, an investigation by ProPublica and The Washington Post has found. The barrage — averaging at least 10,000 posts a day, a scale not reported previously — turned the groups into incubators for the baseless claims supporters of then-President Donald Trump voiced as they stormed the Capitol, demanding he get a second term. Many posts portrayed Biden’s election as the result of widespread fraud that required extraordinary action — including the use of force — to prevent the nation from falling into the hands of traitors.

…The ProPublica/Post investigation, which analyzed millions of posts between Election Day and Jan. 6 and drew on internal company documents and interviews with former employees, provides the clearest evidence yet that Facebook played a critical role in the spread of false narratives that fomented the violence of Jan. 6…”