Dean Sterling Jones writes: “David Mikkelson, the cofounder of the fact-checking website Snopes, has long presented himself as the arbiter of truth online, a bulwark in the fight against rumors and fake news. But he has been lying to the site’s tens of millions of readers: A BuzzFeed News investigation has found that between 2015 and 2019, Mikkelson wrote and published dozens of articles containing material plagiarized from news outlets such as the Guardian and the LA Times.”