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Recent years have witnessed the prosperity of mobile social networks, where various information is shared among mobile users through their opportunistic contacts. To investigate efficiency of information dissemination in wireless networks, epidemic models have been employed to study message forwarding delays, presuming message delivery whenever an opportunistic contact occurs. A practical concern is typically neglected, that one mobile user may only be willing to pass information onto others with social ties, rather than anyone upon contact. Under such a constraint, information dissemination may behave differently, according to the pattern of social ties that exist in the network.
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