A trader raises his hand just before the Twitter Inc. IPO begins on the floor of the New York Stock Exchange in New York, November 7, 2013. Twitter Inc shares soared as much as 92 percent on their first day of trading on the New York Stock Exchange, an extraordinary debut that drove the seven-year-old company's value to more than $25 billion and evoked comparisons to the dot-com bubble of the late 1990s. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY) - RTX154JO