Dick Costolo (L), chief executive of Twitter, and the company's chief financial officer Mike Gupta leave JP Morgan headquarters after a meeting before the firm's IPO in New York, October 25, 2013. Seeking to avoid a repeat of Facebook Inc's much-maligned public debut, Twitter Inc revealed more modest ambitions, saying its initial offering would raise up to $1.6 billion (987.8 million pounds) and value the company at up to about $11 billion. REUTERS/Eduardo Munoz (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY)