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Associated Press
FILE - In this Oct. 1, 2011 a line of police officers block protesters on New York's Brooklyn Bridge during a march by Occupy Wall Street. Twitter agreed on Friday, Sept. 14, 2012, to hand over about three months' worth of tweets to a judge overseeing the criminal trial of Malcolm Harris, an Occupy Wall Street protester, a case that has become a closely watched fight over how much access law enforcement agencies should have to material posted on social networks. (AP Photo/Will Stevens, File)

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