While Transactive Memory Systems (TMS) have been examined within the context of group dynamics as a means of efficiently sharing specialized knowledge, the need to expand this focus to the entire organization has been acknowledged. This study investigates knowledge sharing among individual employees within a firm by exploring the antecedents of out-group TMS. The results indicate that while social media use is essential for identifying the location and information of knowledge, it is necessary that employees be in an environment where they can make decisions to access expertise outside their group.