A social network is set as a graph, and data on social networks take the form of flow, which is mined for various purposes. This book was edited, contributed by leading researchers in this field, presents a wide selection of topics on mining social networks such as the Structural Properties of Social Networks, Discovery Algorithm for Social Network Structure and Content in Social Network Analysis. This book is also unique in its focus on data analysis aspects of social networks on the Internet scenario, rather than the traditional emphasis on the sociology-driven prevalent in the books that exist, that does not focus on the unique characteristics of data-intensive online social network.