Understanding the power of social media as a communication tool in the aftermath of disasters : hearing before the Ad Hoc Subcommittee on Disaster Recovery and Intergovernmental Affairs of the Committee on Homeland Security and Governmental Affairs, United States Senate, One Hundred Twelfth Congress, first session, May 5, 2011

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United States. Congress. Senate. Committee on Homeland Security and Governmental Affairs. Ad Hoc Subcommittee on Disaster Recovery and Intergovernmental Affairs

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