On this episode of “Sway,” Kara Swisher speaks to Mr. Huffman about the ethos behind the online movement, whether Reddit may have been used for market manipulation and if he fears an investigation by the S.E.C. She also presses him on the narrative that this is a David vs. Goliath story of Main Street beating Wall Street — after all, who will be left holding the bag when GameStop’s stock eventually comes crashing?