1 Handbook of Social Network Technologies and Applications Editor-in Chief Borko Furht Florida Atlantic University, Boca Raton, Florida, USA Advisory Board Sonja Buhegger, Deutsche Telekom Laboratories, Berlin, Germany Thorsten Strufe, University of Darmstadt, Germany Anwitaman Datta, Nanyang Technological University, Singapore Lisa Singh, Georgetown University, Washington DC, USA Steffan Staab, University of Koblenz-Landau, Germany Ronald R. Yager, Iona College, New Rochelle, New York, USA Nina D. Ziv, Polytechnic Institute of New York University, USA Susanta Mitra, Meghnad Saha Institute of Technology, Kolkata, India Bin Zhou, Simon Fraser University, Canada Hari Sundaram, Arizona State University, USA Saikat Guha, Max Planck Institute, SaarbruckenKaiserslautern, Germany Table of Contents PART I SOCIAL MEDIA ANALYSIS AND ORGANIZATION Social Network Analysis: History, Concepts, and Research Mingxin Zhang, Wuhan University, Wuhan, China Analysis of Social Networks by Tensor Decomposition Sergej Sizov, Steffan Staab, and Thomas Franz, University of Koblenz-Landau, Germany Structure and Dynamics of Social Networks Revealed by Data Analysis of Actual Communication Services Masaki Aida, Tokyo Metropolitan University, Japan Hideyuki Koto, KDDI R&D Laboratories, Japan Analyzing the Dynamics of Communication in Online Social Networks Nunmun De Choudhury and Hari Sundaram, Arizona State University, USA Ajita John and Doree Duncan Seligmann, Avaya Labs 2 Qualitative Analysis of Commercial Social Networks Profiles Laster Melendez, Florida International University, Miami, Florida, USA Ouri Wolfson, University of Illinois, Chicago, IL, USA Malek Adjouadi and Naphtali Rishe, Florida International University, Miami, Florida, USA Social Network Analysis of Networks Extracted from Log Files Katarina Slaninova, Pavla Drazdilova, Gamila Obadi, Jan Martinovic, and Vaclav Snasel Technical University of Ostrava, Czech Republic Perspectives on Social Network Analysis for Observational Scientific Data Lisa Singh, Elisa Bienenstock, and Janet Mann, Georgetown University, Washington DC, USA Modeling Temporal Variation in Social Networks – an Evolutionary Web Graph Approach Susanta Mitra, Meghnad Saha Institute of Technology, Kolkata, India, and Aditya Bagchi, Indian Statistical Institute, Kolkata, India Churn in Social Networks Marcel Karnstedt, Tara Hennessy, Jeffrey Chan, Conor Hayes, and Partha Basuchowdhuri, Digital Enterprise Research Institute, Galway, Ireland, and Thorsten Strufe, TU Darmstadt, Darmstad, Germany PART II VISUALIZATION OF ONLINE SOCIAL NETWORKS Visualization of Social Networks Ing-Xiang Chen and Cheng-Zen Yang Yuan Ze University, Chungli, Taiwan Novel Visualizations and Interactions for Social Networks Exploration Nathalie Henry Riche, Microsoft Research, and Jean-Daniel Fekete, INRIA, France PART III DISCOVERING SOCIAL NETWORKS USING SEMANTIC APPROACHES Discovering Mobile Social Networks by Semantic Technologies Jason J. Jung, Yeungnam University, South Korea Kwang Sun Choi, Saltlux, SouthKorea and Sung Hyuk Park, KAIST Business School, South Korea 3 Online Identities and Social Networking Muthucumaru Maheswaran and Bader Ali McGill University, Montreal, Canada Discovering Communities from Social Networks: Methodologies and Applications Bo Yang, Jilin University, China Jiming Liu, Hong Kong Baptist University, Hong Kong Detecting Communities in Social Networks Tsuyoshi Murata, Tokyo Institute of Technology, Tokyo, Japan Extracting Social Networks from Text Data Masoud Makrehchi, Thomson Reuters Corporation, Canada Mining Regional Representative Photos from a Consumer-Generated Geotagged Photo Database Keiji Yanai , Bingyu Qiu The University of Electro-Communications. Chofu-shi, Tokyo JAPAN Concept Discovery in Youtube.com using Factorization Method Janice Kwan, Wai Leung, and Chun Hung Li, Hong Kong Baptist University, Hong Kong Collaborative Filtering Based on Choosing a Different Number of Neighbors for Each User Antonio Hernando, Jesús Bobadilla, and Francisco Serradilla Universidad Polit´ecnica de Madrid. Madrid, Spain PART IV SOCIAL NETWORK INFRASTRUCTURES AND COMMUNITIES Distributed/Decentralized Online Social Networks Sonja Bucheegger, Deutsche Telecom laboratories, Berlin, Germany Anwitaman Datta, Nanyang Technological University, Singapore Thorsten Strufe, University of Darmstadt, Germany Multi-modal Characterization of Social Network Communities Yu-Ru Lin, Hari Sundaram, and Aisling Keliher, Arizona State University, USA Accessability Testing of Social Websites Cecilia Sik Lanyi, University of Pannonia, Veszprem, Hungary Understanding and Predicting Human Behavior for Social Communities Jose Simoes and Thomas Magedanz, Fraunhofer Fokus, Berlin, Germany 4 PART V PRIVACY IN ONLINE SOCIAL NETWORKS Managing Trust in Online Social Networks Touhid Bhuiyan, Queensland University of Technology, Australia Audun Josang, University of Oslo, Norway Yue Xu, Queensland University of Technology, Australia Security and Privacy Threats in Online Social Networks Leucio-Antonio Cutillo, Eurocom, Sophia Antropolis, France, and Mark Manulis and Thorsten Strufe, University of Darmstadt, Germany Investigation of Key Player Problem in Terrorist/Covert Networks using Bayes Conditional Probability D.M. Akbar Hussain, Aalborg University, Denmark Optimizing Targeting of Intrusion Detection Systems in Social Networks Rami Puzis, Meytal Tubi, and Yuval Elovici, Ben-Gurion University of the Negev, Israel Privacy Preservation Publishing Through a Graph Partition Approach Bin Zhou and Jian Pei, Simon Fraser University, Canada Defining Privacy in Online Social Networks Saikat Guha, Max Planck Institute for Software Systems, SaarbruckenKaiserslautern, Germany PART VI APPLICATIONS OF SOCIAL NETWORKS Applications of Social Network Analysis P.Santhi Thilagam, National Institute of Technology Karnataka, Surathkal, India Online Advretising in Social Networks Abraham Bagherjeiran, Rushi Bhatt, and Rajesh Parekh, and Vineet Chaoji, Yahoo! Labs Social Bookmarking on a Company's Intranet: A Study of Technology Adpotion and Diffusion Nina D. Ziv and Kerry-Ann White, Polytechnic Institute of New York University, New York, USA 5 Collaborative Recommendations with Content-based Filters for Cultural Activities via a Scalable Event Distribution Platform Toon De Pessemier, Sam Coppens, Kristof Geebelen, Chris Vleugels, Stijin bannier, Erik Mannens, Kris Vanhecke, and Luc Martens, Ghent University, Ghent, Belgium