WashingtonCNN — Taylor Swift didn’t endorse former President Donald Trump last weekend. Ryan Reynolds wasn’t photographed wearing a pro-Kamala Harris shirt. And the Communist Party USA never backed President Joe Biden’s now-defunct campaign.

But these false claims about the 2024 campaign, and dozens of other posts with similar fake endorsements, have exploded on social media in the run up to the election, according to researchers at the News Literacy Project, a nonpartisan education group that launched a new database Thursday chronicling more than 550 unique instances of election-related misinformation.