The explosive growth of the internet as the main source of information and knowledge hasgreatly impacted the manner in which people make use of their memory. As a result, interest inthe internet environment, and in particular in the role of transactive memory in a social mediaenvironment, has been heightened. Transactive memory refers to a shared memory systemthrough which the necessary information and knowledge is obtained using an external repository. As such, it differs from the existing memory system in which necessary information and knowledgeis dependent on the individual’s incomplete memory structure. It revolves around comprehendingthe person who possesses the necessary information and knowledge rather than rememberingthe knowledge and information itself. The majority of existing studies have been focused onproving the usefulness of transactive memory based on research at the organizational level. However, the marked increase in the influence of social media has heightened the need forresearch on individual transactive memory. Factors such as the emergence of various socialnetwork services, diffusion of smart phones, and the popularization of mobile internet haveresulted in the ripple effects caused by social media becoming increasingly large. The use ofsocial media has created various benefits, such as knowledge sharing activities amongst theparticipants, formation of human networks, communication with various people, and thematerialization of online interest groups. The emergence of social media has made it possiblefor its users to form various human networks. Social media has positioned itself as a new typeof communication method. While customers have used social media as a tool to promptly acquire new information, businesses have established differentiated marketing strategies based onsocial media. The diffusion and use of social media have increased the opportunities for users toacquire and use such information. Users of social media employ their own transactive memoryto access the various information available on social media. They can promptly access qualitativeinformation by using their transactive memory and appropriately filter the useful informationfrom the information overload. However, not all people boast the same transactive memory atthe individual level; rather, such memory is differently formed depending on factors such associal environment and individual characteristics. Individual differences can emerge dependingon the degree of interaction with other people, capability to collect and use information, andthe will to use such information. As such, the formation and ability to use the transactivememory that differs between individuals are defined as the transactive memory capability. Thisstudy introduced social interaction, social presence, self-monitoring, and core self-evaluationas the factors impacting the formation of transactive memory capacity. The impact of transactivememory capability on the tertius iungens orientation and individual job performance were alsoverified. The research model was empirically verified using a structural equation model. Thestudy revealed that the four antecedent factors included in the research model significantlyimpacted individuals’ transactive memory capability, and that the transactive memory capabilitypositively influenced the tertius iungens orientation and job performance. Lastly, the results ofthe study were discussed, and the theoretical and practical implications were introduced.