Twitter fact-checks Donald Trump’s tweet for the first time

Twitter for the first time prompted readers to check the facts in tweets sent by U.S. President Donald Trump, warning that his claims about mail-in ballots were false and had been debunked by fact checkers.
The move marked a dramatic shift for the social network, Trump’s primary tool for getting an unfiltered version of his message out to his political base, after years of permissive policies around content on its platform.
The company has been tightening those policies in recent years amid criticism that its hands-off approach had allowed abuse, fake accounts and misinformation to thrive.