Facebook groups topped 10,000 daily attacks on election before Jan. 6, analysis shows. 

Review of millions of posts show Facebook played a critical role in spreading false narratives that fomented violence that day.

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.