To Ulla's compiled list let me add what might be the most explicit treatment of norm breaking and community response

Du Val Smith "Problems of conflict management in virtual communities" in Smith & Kollock, Communities in Cyberspace. 134-161
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Nancy Baym      http://www.ku.edu/home/nbaym
Communication Studies, University of Kansas
102 Bailey Hall, 1440 Jayhawk Blvd., Lawrence, KS 66045, USA
Association of Internet Researchers: http://aoir.org