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As the role of Internet users has evolved to the creator or generator of novel products and content, the concept of the participative web and user-created content(UCC) emerged as one of the key issues in business and academic fields. This study investigated the roles of technology and social factors in the context of user-created contents service. Although technology acceptance model(TAM) that relies on technology factors(i.e., perceived usefulness and perceived ease of use) has been useful for understanding general information technology usage, social factors(i.e., perceived responsiveness and perceived critical mass in this study) could be also critical variables for investigating UCC service adoption. For an empirical exploration, 245 samples were collected from the users of an UCC service site. The results of data analysis using Structural Equation Modeling(SEM) confirm that not only the technology factors but also the social factors contributed significantly to explaining intention to use UCC service via user's attitude. The results of this paper might be useful for future research on UCC service adoption.