Twitter IPO filing

INITIAL PUBLIC TWITTERING: So Twitter itself has tweeted about a "confidential" IPO filing, and the Internet has its knickers in a twist. So let's clear up some confusion right quick: The filing just indicates an intention to go public at some point, and the "confidential" part just means Twitter qualifies as an "emerging growth" company and can keep documentation about its financial worth closer to the vest. Some estimates have Twitter's IPO going down by year's end. And if #TwitterMusic is any indication, it should go gangbusters. (9/12p)