Twitter‐based information distribution during the 2009 Red River Valley flood threat

University of Colorado, Boulder. She can be reached at palen<at>colorado.edu. Kate Starbird and Sarah Vieweg are Ph.D. students in the Technology, Media & Society Program (ATLAS) at the University of Colorado, Boulder. They can be reached at Catharine.Starbird<at>colorado.edu and Sarah.Vieweg<at>colorado.edu, respectively. Amanda Hughes is a doctoral student in the Department of Computer Science, University of Colorado, Boulder. She can be reached at Amanda.Hughes<at>colorado.edu. Twitter-based Information Distribution during the 2009 Red River Valley Flood Threat by Leysia Palen, Kate Starbird, Sarah Vieweg and Amanda Hughes