Hui-Qian Li is a research scientist in the Key Lab of Complex Systems and Intelligent Science at Institute of Automation, Chinese Academy of Sciences. Her research interests include complex networks, recommendation systems, statistical machine learning.E-mail:huiqian.li,fen@ia.ac.cn Fen Xia is an assistant professor in the Key Lab of Complex Systems and Intelligent Science at Institute of Automation, Chinese Academy of Sciences. His research interests include statistical machine learning, ranking, regularization methods, efficient algorithms, and information retrieval. E-mail:fen.xia@ia.ac.cn Daniel Zeng received his Ph.D. degree in industrial administration from Carnegie Mellon University in 1998. He is a research professor at the Institute of Automation, Chinese Academy of Sciences. He is also affiliated with the University of Arizona as an associate professor and the director of the Intelligent Systems and Decisions Laboratory. Prof. Zeng is a senior member of IEEE, His research interests include software agents and multi-agent systems, intelligence and security informatics, social computing and recommender systems.E-mail:dajun.zeng@ia.ac.cn Fei-Yue Wang received his Ph.D. degree in computer and systems engineering from Rensselaer Polytechnic Institute in 1990. He is the director of the Key Laboratory of Complex Systems and Intelligence Science at the Chinese Academy of Sciences. He is also a professor in the University of Arizona's Systems & Industrial Engineering Department and the director of the university's Program in Advanced Research of Complex Systems. Prof. Wang is a fellow of IEEE, INCOSE, IFAC, ASME, and AAAS. His current research interests include social computing, Web and services science, modeling, analysis and control of complex systems, especially social and cyber-physical systems. E-mail:feiyue.wang@ia.ac.cn Wen-Ji Mao received her Ph.D. degree in computer science from the University of Southern California in 2006. She is an associate professor at th