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FILE - In this May 31, 2007, file photo, a structure is destroyed after a tornado briefly touched down in Guymon, Okla. The National Weather Service in Norman has used Twitter and Facebook for years to disseminate weather warnings. But they tried a new approach recently, holding an online “tornado drill.” (AP Photo/Guymon Daily Herald, Heather Avey, File)

FILE - In this May 31, 2007, file photo, a structure is destroyed after a tornado briefly touched down in Guymon, Okla. The National Weather Service in Norman has used Twitter and Facebook for years to disseminate weather warnings. But they tried a new approach recently, holding an online “tornado drill.” (AP Photo/Guymon Daily Herald, Heather Avey, File)

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