Robert Galbraith/Reuters Shares of GameStop surged 19% on Thursday, bucking the broader market slump. Reddit chatter seemed to have picked up around 2 PM ET. At around the same time, Ryan Cohen tweeted a photo, which users interpreted the post as a positive outlook for GameStop. Sign up here for our daily newsletter, 10 Things Before the Opening Bell Shares of GameStop surged 19% on Thursday, bucking a broader market slump amid a massive sell-off as the chatter on Reddit appeared to gain traction yet again.