'Roaring Kitty' doubles down on GameStop shares, stock pops

The kitty is still roaring, so GameStop is soaring. Shares in the video game retailer shot up as much as 20 percent on Monday after social media influencer Keith Gill — who goes by the name of "Roaring Kitty" on YouTube and "DeepF***ingValue" on Reddit — posted a screenshot showing that he had doubled his...