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.

“LOOKS LIKE CIVIL WAR is BECOMING INEVITABLE !!!” read a post a month before the Capitol assault. “WE CANNOT ALLOW FRAUDULENT ELECTIONS TO STAND ! SILENT NO MORE MAJORITY MUST RISE UP NOW AND DEMAND BATTLEGROUND STATES NOT TO CERTIFY FRAUDULENT ELECTIONS NOW !”