US video game retailer GameStop's shares surged 92.7% on Tuesday to record an all time high after the world's richest person and Tesla CEO Elon Musk tweeted, "Gamestonk!!" He also shared a link to Reddit's WallStreetBets stock trading discussion group, which has helped propel GameStop's shares in the recent days from $19 on January 12 to $147.98 on Tuesday.