FILE - In this Thursday, Feb. 17, 2011 file photo, al-Shabab fighters march with their weapons during military exercises on the outskirts of Mogadishu, Somalia. Twitter suspended the account used by the Somali militants on Friday, Jan. 25, 2013, after the insurgents used the micro-blogging site to post a hostage video and death threat. (AP Photo/Mohamed Sheikh Nor, File)

Associated Press
FILE - In this Thursday, Feb. 17, 2011 file photo, al-Shabab fighters march with their weapons during military exercises on the outskirts of Mogadishu, Somalia. Twitter suspended the account used by the Somali militants on Friday, Jan. 25, 2013, after the insurgents used the micro-blogging site to post a hostage video and death threat. (AP Photo/Mohamed Sheikh Nor, File)
FILE - In this Thursday, Feb. 17, 2011 file photo, al-Shabab fighters march with their weapons during military exercises on the outskirts of Mogadishu, Somalia. Twitter suspended the account used by the Somali militants on Friday, Jan. 25, 2013, after the insurgents used the micro-blogging site to post a hostage video and death threat. (AP Photo/Mohamed Sheikh Nor, File)
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