https://www.wsj.com/articles/the-social-media-fact-check-farce-11606519380?mod
In recent years liberals have successfully lobbied social-media companies to police conservative content more and more aggressively. But there’s little evidence that this political interference has reduced the prevalence of misinformation online—and a new study shows how it could make the problem worse.
In the study—by Dino Christenson of Boston University and Sarah Kreps and Douglas Kriner of Cornell—volunteers were shown a May 26 tweet by President Trump attacking mail-in voting and claiming that “Mail boxes will be robbed, ballots will be forged & even illegally printed out & fraudulently signed.”
Groups of participants were also shown “corrections” to Mr. Trump’s tweet, including Twitter’s “explanatory text labeling the claims ‘unsubstantiated’ according to major media outlets, including CNN and the Washington Post.”
Conservatives did not find mainstream-media assurances convincing. For Republicans who were shown Twitter’s effort to debunk the President, “belief that mail voter fraud occurs was more than 13% higher than in the control.” Or as the authors put it, “corrections increased misperceptions among those predisposed to believe President Trump.”