Closing the Barn Door? Fact-Checkers as Retroactive Gatekeepers of the COVID-19 "Infodemic".

Based on a study of U.S.-tagged items in a global database of fact-checked statements about the novel coronavirus throughout the first year of the pandemic, this article explores the nature of fact-checkers' "retroactive gatekeeping." This term is introduced here to describe the process of assessing the veracity of information after it has entered the public domain rather than before. Although an overwhelming majority of statements across 16 thematic categories were deemed false and debunked, often repeatedly, misinformation continued to circulate freely and widely.