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About the Authors Vincent Buskens is associate professor in the Department of Sociology/ICS at Utrecht University. Coye Cheshire is assistant professor at the School of Information at University of California, Berkeley. Karen S. Cook is Ray Lyman Wilbur Professor of Sociology, current chair of the Department of Sociology, and director of the Institute for Researchin the Social Sciences at Stanford University. Chris Snijders is professor of sociology of technology and innovation at the School of Innovation Sciences at Eindhoven University of Technology. Judd Antin is Ph.D. candidate at the School of Information at University of California, Berkeley. Brandy Aven is Ph.D. candidate in the Department of Sociology at Stanford University. Davide Barrera is assistant professor in the Department of Gary E. Bolton is professor in the Smeal College of Business at Penn State University and director of the Laboratory for Economic Management and Auctions (LEMA). Andreas Diekmann is professor of sociology at ETH Zurich. Sociology/ICS at Utrecht University. Alexandra Gerbasi is assistant professor of sociology at California State University, Northridge. Ben Jann is research scientist at ETH Zurich. Tapan Khopkar received a Ph.D. from the School of Information at the University of Michigan. Azi Lev-On is senior lecturer and head of new media track at the Ariel University Center. Masafumi Matsuda is research scientist at NTT Communications Science Laboratories, Hokkaido. Uwe Matzat is assistant professor at the School of Innovation Sciences at Eindhoven University of Technology. Axel Ockenfels is professor in the Department of Economics at the University of Cologne. Paul Resnick is professor at the School of Information at the University of Michigan. Hiroyuki Takahashi is research scientist at NTT Resonant, Inc., Tokyo. Yukihiro Usui is research scientist at NTT Advanced Technology Corporation, Tokyo. Sonja Utz is assistant professor for Internet and new media in the Department of Communication Science at VU University , Amsterdam. Jeroen Weesie is associate professor in the Department of Sociology/ICS at Utrecht University. David Wyder is a former student of Andreas Diekmann and now works for PostFinance Swiss Post. Toshio Yamagishi is professor in the Department of Behavioral Science at Hokkaido University, Sapporo. Noriaki Yoshikai is professor in the School of Engineering at Nihon Daigaku, Tokyo. x About the Authors ...

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