Dave Karpf is an Assistant Professor of political communication in George Washington University’s School of Media and Public Affairs. His research focuses on the internet and political organizations. He is the author of The MoveOn Effect: The Unexpected Transformation of American Political Advocacy (Oxford University Press, 2012). His work has also appeared in the Journal of Information Technology and Politics, Policy & Internet, and Information, Communication, and Society. Dave writes about online politics at shoutingloudly.com, and tweets as @davekarpf.