The rapid proliferation of information technologies especially Web 2.0 techniques have changed how researchers conduct research, especially how they contribute academic knowledge online. Research social network constructed based on Web 2.0 techniques as a particular academic platform helps researchers create and find knowledge easily. Research social network helps researchers to share academic knowledge via tagging it. However, the reasons for researchers’ meta-knowledge (knowledge about knowledge, e.g., tags given by researchers to annotate academic knowledge) contribution in research social network context and the extent to which this may differ from traditional knowledge contribution behavior in conventional virtual communities remain largely unexplored. To address this issue, this research use social capital theory to further understand researchers’ meta-knowledge contribution behavior based on data collected from a particular research social network: CiteULike. The findings provide new perspective to understand researchers’ meta-knowledge contribution behavior in research social network.