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Routing in delay tolerant networks (DTN) have attracted a great interest recently. Increasingly popular type of DTNs are mobile social networks (MSN) also called pocket switched networks. Hence, analyzing accurately social network properties has become an important issue in designing efficient routing protocols for MSNs. In this paper, we first introduce a new metric for detecting the quality of friendships accurately. Using the introduced metric, each node defines its friendship community asdoi:10.1109/glocom.2010.5683082 dblp:conf/globecom/BulutS10 fatcat:rjy4cfmhz5ehdcshwxvq2ugj7i