Abstract-Organizational learning is affected by knowledge sharing. This paper seeks to add to the research on the role of social capital in promoting knowledge sharing among employees in Social Networking Sites. We examined the influence of SNSs usage on social capital that has 3 dimensions: structural (social interaction ties), relational social capital (trust, norms of reciprocity, and identification), cognitive (shared vision) and then social capital's influence on knowledge sharing among 97 employees. The result was analyzed using PLS-SEM method to examine the hypotheses. The results showed that Social Networking Sites usage affects Social Capital and cognitive dimension of social capital influence knowledge sharing.