The semantic Web embodies a vision for a new era in the management and exploitation of Web content by people and machines. Although it poses great research challenges, the Web industry and user community have not yet embraced this vision. At the same time, Web 2.0 is increasingly gaining ground despite its unsophisticated nature or, more likely, because of it. Despite the apparent tension between the semantic Web and the social Web, they are essentially compatible and call coexist.