Hundreds of social media videos showed people hitting it big on Polymarket. But it turns out, none of it was real. WSJ’s Caitlin Ostroff and Katherine Long report on their investigation into a fake viral marketing campaign. Ryan Knutson hosts.Further Listening:- Insiders Are Cashing In on Prediction Markets- How Betting on U.S. Politics Is Getting BigLearn more about your ad choices. Visit megaphone.fm/adchoices