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The use of social media technologies—such as blogs, wikis, social networking sites, social tagging, and microblogging—is proliferating at an incredible pace. One area of increasing adoption is organizational settings where managers hope that these new technologies will help improve important organizational processes. However, scholarship has largely failed to explain if and how uses of social media in organizations differ from existing forms of computer-mediated communication. In this chapter, we argue that social media are of important consequence to organizational communication processes because they afford behaviors that were difficult or impossible to achieve in combination before these new technologies entered the workplace. Our review of previous studies of social media use in organizations uncovered four relatively consistent affordances enabled by these new technologies: Visibility, persistence …