Abstract
Research on transactive memory systems has shown the importance of knowledge about who knows what. Going beyond the issue of work group settings, the article underlines the importance of such knowledge for finding one's way through today's knowledge society. We discuss how social networking sites can be used to manage individual knowledge networks. Therefore, we describe characteristics of social networking sites resulting in the conclusion that user profiles serve as a base for an external transactive memory system. Furthermore, we draw attention to the perspective of the individual users and the functions that user profiles have for them. This leads to guiding propositions how to improve the implementation of user profiles for establishing and maintaining an useful external transactive memory system.
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