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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)
Photo by: Jeff Chiu
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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