At TEDU 2009, Erik Hersman presents the remarkable story of Ushahidi, a GoogleMap mashup that allowed Kenyans to report and track violence via cell phone texts following the 2008 elections, and has evolved to continue saving lives in other countries during the crucial first three hours of any crisis. (Recorded at TEDU 2009, February 2009, in Long Beach, California. Duration: 3:57.)
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