Social Capital and Entrepreneurship provides a critical review of the concepts and principles of social capital and social networks as applied to entrepreneurship. The authors examine interesting research questions and offer a toolbox of methods to answer them. First, a popular new website, Friendster, is used to show the potential power of social capital accessed via social networks. Unfortunately, the potential of social networks often cannot be realized because of various socio-cultural constraints. Taking account of these constraints, the authors offer three empirical generalizations about social networks and show how the concepts of homophily, social boundaries, and bounded rationality provide a framework for understanding the observations. In reviewing these generalizations, well established theoretical contributions and empirical findings from the social capital and social networks literatures are provided to help the reader understand these concepts. Throughout the text, various research designs are explained for studying social networks, as well as the issues around their use. Social Capital and Entrepreneurship concludes by examining the tension between the properties of social networks used in entrepreneurship research models and the limited perspective on networks available to practicing entrepreneurs. Social Capital and Entrepreneurship is intended for scholars and graduate students in the field of entrepreneurship who wish to learn the basic vocabulary of social network and social capital analyses. In addition, entrepreneurs can gain insight into the use of social networks in practice.