More often than not, people are active in more than one social net-work. Identifying users from multiple heterogeneous social net-works and integrating the different networks is a fundamental is-sue in many applications. The existing methods tackle this prob-lem by estimating pairwise similarity between users in two net-works. However, those methods suffer from potential inconsistency of matchings between multiple networks. In this paper, we propose COSNET (COnnecting heteroge-neous Social NETworks with local and global consistency), a novel energy-based model, to address this problem by considering both local and global consistency among multiple networks. An efficient subgradient algorithm is developed to train the model by converting the original energy-based objective function into its dual form. We evaluate the proposed model on two different genres of data collections: SNS and Academia, each consisting of multiple het-erogeneous social networks. Our experimental results validate the effectiveness and efficiency of the proposed model. On both data collections, the proposed COSNET method significantly outper-forms several alternative methods by up to 10-30% (p 0.001, t-test) in terms of F1-score. We also demonstrate that applying the integration results produced by our method can improve the accu-racy of expert finding, an important task in social networks.
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