Abstract
The purpose of this study is to investigate the critical success factors of platform leadership in the Web 2.0 based service business environment. Because of the lack of theoretical foundation for this topic, we adopted relevant theory and case study analyses. Representative Web 2.0 firms which have developed platform leadership were chosen and analyzed on the basis of previous research on platform strategy through spider web analysis. This study shows that Web 2.0 firms such as Google, Flickr, and Salesforce.com differ in their competitive capabilities for platform leadership. The result of this research suggests that platform leadership in the Web 2.0 era depends on five interdependent dimensions: innovation ability, connectivity, complementarities, efficiency, and network effects.