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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 Big Learn more about your ad choices. Visit megaphone.fm/adchoices