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In this paper we use the social networks of active members (i.e. authors) in online communities to predict their future behavior. We limit our discussion to Web forums, the most generic type of online communities. We first address the problem of measuring the ties between authors where there is (almost) no direct information (i.e. citations) about the tie between two authors. We developed a surrogate metrics to this problem so that a corresponding social network can be constructed. However, while such networks are suitable for describing authors' behavior, they are not very suitable for predicting their future behavior. Here we suggest a very specific method for creating networks of authors that is specially designed for prediction. The main characteristic of our approach is that we take into account all available data while putting more weight on more recent data (messages). In addition to networks of authors, we also use the two-mode network of threads (topics) to generate predictions.All network data and other information related to the posting habits of the authors are thus used to develop an algorithm that predicts the future behavior of the authors. The ultimate goal of our research is to generate explicit recommendations for authors of online communities about which authors and which topics/threads to follow. Finally, these predictions/recommendations can be used as the basis for a more user-friendly forum interface.