Enterprise communication applications rely on automated reasoning about factors such as expertise for connecting people. Quantifying expertise is necessary for such applications because of the time constraints imposed by communications routing. This paper discusses the potential for collaborative tagging in the enterprise and how it enables the formation of social networks around tags or topics. These social networks are reflective of the interests and expertise of users contributing to the tag. The tagging activity of a user contributes to the expertise of the user and influences the expertise of other users. The paper proposes a ranking mechanism for expertise based on the tagging activity of users for both unstructured and structured tag spaces. The paper also briefly describes a communication platform that will incorporate the ranking mechanism
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