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Academic Social Networking sites have been embraced by professors from across disciplines. These sites provide a myriad of networking and collaborative opportunities for faculty to expand their scholarly horizons and broaden their research impact. In this article, we analyzed the usage patterns of three Academic Social Networking sites, namely ResearchGate, Google Scholar Citations, and Academia.edu, at an urban, public, state university in Southern California with a highly diverse student population of more than 28,000 and more than 1700 faculty members. Our objectives are to describe and analyze professors’ use of these three Academic Social Networking sites based on their subject areas and academic ranks.