Social media is [sic] often recognized narrowly as a way to connect with friends, or to share and read the news. Yesterday it was demonstrated that social media can serve as a medium of mobilization for disaster relief, helping Americans all over the country reach out and help those affected by the tornado in Oklahoma on Monday.
Shortly after the destructive twister tore through the town of Moore outside Oklahoma City , conservative radio personality and talking head Glenn Beck used Twitter to organize a "convoy of hope" to travel to Oklahoma to provide early disaster relief. Within hours, Beck's team had used Twitter to locate trucks and supplies, and they were on their way, arriving in the Moore area bearing food, water, and diapers.
UPDATE: I neglected to give the source. It's here.