Advances in Web Mining and Web Usage Analysis, 9th International Workshop on Knowledge Discovery on the Web, WebKDD 2007, and 1st International Workshop on Social Networks Analysis, SNA-KDD 2007, San Jose, CA, USA, August 12-15, 2007. Revised Papers

Spectral Clustering in Social Networks.- Looking for Great Ideas: Analyzing the Innovation Jam.- Segmentation and Automated Social Hierarchy Detection through Email Network Analysis.- Mining Research Communities in Bibliographical Data.- Dynamics of a Collaborative Rating System.- Applying Link-Based Classification to Label Blogs.- Why We Twitter: An Analysis of a Microblogging Community.- A Recommender System Based on Local Random Walks and Spectral Methods.