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These framings result in research detailing characteristics, personal identities, and behaviors of large numbers of connected and interacting individuals, while the social identity concepts that lead to intra- and inter-group dynamics have received less attention. We argue that the emergent properties of self-categorization and social identity, which are particularly fluid and complex in online spaces, provide a complementary perspective with which to re-examine traditional topics in social computing. We discuss the applicability of the Social Identity Perspective to established and new research domains in CSCW, proposing alternative perspectives on self-presentation, social support, collaboration, conflict, and leadership. We note methodological considerations emerging from this theory. 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