Honestly, it shouldn't come as any shock: the microblogging service that made it perfectly acceptable to deliver huge, huge news in 140 characters or less has just done precisely that. Twitter has announced that it has "confidentially submitted an S-1 to the SEC for a planned IPO," but details beyond that are being kept under wraps. What's it mean? Those with equity in the company are about to become mind-numbingly rich; Wall
