Information Technology Journal1812-56381812-5646Asian Network for Scientific Information10.3923/itj.2011.2252.2259GuoXin XiangYang ChenQian WeiWei 1220111012A Social network graph shows social interactions and relationships between individuals in a specific social environment, which is very helpful for analyzing social relationships, activities, structures, etc. The author quantized the strengths of social objects relationships in social environment using an improved vector space model. Gaussian mixture model was employed to set the threshold for identifying social relationships adaptively and divide social subgroups automatically. According to the threshold, social network graph would be constructed based on performance measures. It is concluded that hidden social relationships can be discovered effectively by using this approach which is very flexible and adaptive for dynamic information feedback mechanism.]]>Freeman, L.,2006Mika, P.,20075515Diesner, J. and K.M. Carley,20052005pp: 81-108pp: 81-108Magnini, B., M. Negri, R. Prevete and H. Tanev,2002113844Salton, G., A. Wong and C.S. Yang,197518613620Guo, X., Y. Xiang and Q. Chen,20112011Allan, J., R. Papka and V. Lavrenko,19981998pp: 3745Ma, L., Q. Chen, S. Ma, M. Zhang and L. Cai,20022002Collins-Thompson, K., P. Ogilvie, Y. Zhang and J. Callan,20022002Srikanth, M., X. Wu and R. Srihari,20022002Anghelescu, A., E. Boros, D. Lewis, V. Menkov, D. Neu and P. Kantor,20022002Callan, J.,19961996pp: 262269