In this paper, bibliometric (co-citation analysis) and social network analysis techniques are used to investigate the intellectual pillars of the electronic commerce literature as reported in SSCI and SCI journals between 2002 and 2006. By analyzing 22,760 citations of 840 articles, this study maps an invisible network of knowledge of electronic commerce studies. The paper shows that electronic commerce literature focus on three key themes: strategy and electronic marketplace, consumer behavior in electronic commerce, and implications of electronic shopping. The results of the mapping can help identify the research direction of electronic commerce research and provide a valuable tool for researchers to access the literature in this area.