Shares of GameStop (GME) and other meme stocks popped on Thursday after Roaring Kitty, the online alias of meme stock ringleader Keith Gill, posted to X for the first time since September. Shares of GameStop jumped as much as 14% Thursday afternoon while AMC Entertainment (AMC), another favorite among meme stock traders, surged as much as 13%. Shares of online pet retailer Chewy (CHWY), also a meme stock favorite, were unaffected. Gill, at 1:45 p.m. ET on Thursday, posted a photo of a fake TIME Magazine co ...