The effect was immediate and dramatic. After Twitter banned Donald Trump and some allies, misinformation about election fraud plunged dramatically. The Washington Post reports the research firm Zignal Labs found a 73% drop after the ban last week.

The new research by the San Francisco-based analytics firm reported that conversations about election fraud dropped from 2.5 million mentions to 688,000 mentions across several social media sites in the week after Trump was banned from Twitter.

Trump has been banned from Twitter, Facebook, Snapchat, Twitch, Spotify, and Shopify, according to the Post. Twitter also banned more than 70,000 accounts associated with the baseless QAnon ideology.

Zignal found that the use of hashtags affiliated with the Capitol riot also dipped considerably. Mentions of the hashtag #FightforTrump, which was widely deployed across Facebook, Instagram, Twitter and other social media services in the week before the rally, dropped 95 percent. #HoldTheLine and the term “March for Trump” also fell more than 95 percent.