FILE - In this Oct. 1, 2011 file photo, police arrest protesters on New York's Brooklyn Bridge during 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/Stephanie Keith, File)

Associated Press
FILE - In this Oct. 1, 2011 file photo, police arrest protesters on New York's Brooklyn Bridge during 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/Stephanie Keith, File)
FILE - In this Oct. 1, 2011 file photo, police arrest protesters on New York's Brooklyn Bridge during 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/Stephanie Keith, File)
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