5Butt, R. S. (1999).The social capital of opinion leader. Retrieved from http://faculty. chicagobooth.edu/ronald.Burt/research/files/SCOL.pdf.
6Holmes, J. G. & Remple, J. K. (1989). Trust in close relationships. In C. Hendrick (ed.), Close relationships. Thousand Oaks: Sage Publications.
7Lin, Hsiu-Fen (2008). Determinants of successful virtual communities: contributions from system characteristics and social factors. Information & Management, 45 (8), 522- 527.
8Paine, K.D. (2003). Guidelines for measuring trust in organizations. Retrieved from http:// www.instituteforpr.org/wp-content/uploads/2003_MeasuringTrust.pdf.
9Porter, C. E. & Donthu, N. (2008). Cultivating trust and harvesting value in virtual communities. Management Science, 54 (1), 113-128.
10Raghupathi, V., Arazy, O., Kumar, N. & Shapira, B. (2007). The antecedents of opinion leadership indicators in social networks. Proceedings of the 6th Workshop on e-Business (WEB), Montreal.