Twitter (TWTR) has reportedly attracted enough interest for its IPO to be oversubscribed. The demand comes even though Twitter's management has refrained from outlining how the micro-blogging Web site plans to break even. Twitter intends to sell 70M shares at a price range of $17-20 each, although it could end up selling the stock for more than that and/or increase the number of shares it will offer. The company is due to price the shares on Wednesday and start trading on Thursday.