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Challenges abound for Twitter heading into IPO

Associated Press
Challenges abound for Twitter heading into IPO

This photo shows the sign outside of Twitter headquarters in San Francisco, Monday, Nov. 4, 2013. Seven years after co-founder Jack Dorsey sent the first tweet through the online messaging service, more than 500 million posts are shared each day by everyone from the Dalai Lama to Justin Bieber. (AP Photo/Jeff Chiu)

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