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Identify Experts from a Domain of Interest

User networks are beginning to be increasingly difficult to manage because of the large volume of information which is circulated within them. For example, in the Yahoo!Answers network, the large number of questions makes the identification of an expert, who would be the most suited to answer a question, a long-lasting process (currently this process is semi-automatic). This paper proposes an automatic identification method of a human expert, who would be the most suited to answer a question from a certain user of Yahoo network.