Twitter’s “fact-check” of a tweet from President Trump about mail-in voting contained an error that had to be corrected by election officials.

“There was an error in Twitter’s fact check of Trump’s vote-by-mail tweets, underscoring the challenge social media platforms face trying to arbitrate truth,” Wall Street Journal reporter Dustin Volz wrote on Twitter. “It was corrected after an elections professional notified the company (and me) about the mistake.”

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