It is widely established that the levels of generalized trust, norms of reciprocity, and identification (collectively known as relational social capital) in a virtual community have a positive effect on a member’s motivation to contribute knowledge in the community. However, little is known on the antecedents of such relational social capital. This study longitudinally investigates the effects of the strength of network ties on the development of relational social capital in a virtual local community in a Southeast Asia country. It also empirically validates the relationship between relational social capital and actual knowledge contribution. Analyzing 98 community members, the author found that the formation of weak ties is significant on the members’ sense of identification with the community, which in turn positively affects their volume of knowledge contributed in the community.