Understanding individual acceptance of information and communication technologies (ICTs) and predicting potential behavior has been a primary concern of the information systems field, and discussions have predominantly focused on pre-adoption, adoption intention, and continuance intention. In contrast, research focusing on "use" after adoption has been relatively insufficient. However, understanding usage behavior is important because it can serve as a useful indicator for predicting future potential behavior and the adoption of further innovations. From this perspective, this study empirically analyzed the influence relationships among "perceived benefits," "perceived costs," "coupling," and "active use intention" as key variables to identify factors affecting the activeness of SNS active usage behavior. The main research findings are as follows. First, perceived benefits had a positive (+) effect on active use intention, while perceived costs had a negative (−) effect. That is, the greater the perceived benefits, the higher the intention for active SNS use. Second, perceived benefits had a negative (−) effect on coupling, while perceived costs had a positive (+) effect on coupling. Therefore, the greater the perception of costs, the greater the perception of coupling. Third, based on prior research, coupling was expected to have a positive effect on active use intention, but the hypothesis was rejected. In particular, although not statistically significant, the possibility of a negative (−) relationship between coupling and active use intention was observed, prompting additional analysis of the relationship between coupling and passive use intention. The additional analysis confirmed that coupling had a positive effect on passive use intention. This contradicts prior research on coupling in traditional products and services, which found that coupling promotes active consumption behavior. Such results are attributed to the distinctive characteristics of SNS as a web-based service that does not require monetary payment and as an environment where behavioral costs such as time, effort, and psychological burden are continuously required throughout SNS use, rather than being a one-time cost payment. This study has research significance in that it empirically examined the factors influencing active use intention after information technology adoption and verified the coupling effect in the SNS context.