Abstract: An antecedents and performance model of social media use is constructed to explore the influence of rational information supplementary value, interpersonal communication value, younger level and subjective norms based on the view of individual social capital value of B2B boundary spanners, and take the boundary management performance as independent variable, the individual's innovation as a moderate variable. It conducts a questionnaire survey among B2B boundary spanners to test the assumptions. The empirical results show that the four independent variables have the most significant relationship with the social media business use and the social media use also positively improves the performance of boundary management. The individual innovation positively moderates the relationship between the rational information supplementary value, interpersonal communication value and social media use, but the moderating roles of younger level and subjective norms on the social media use is not significant. Relevant results have some management implications for B2B business managers and social media platforms.

Key words: B2B social media, individual social capital, boundary spanners