With the development of advanced mobile devices and social network services,\r\nmobile social network (MSN) has become popular in recent years. This paper we\r\npresent a new perspective of MSN, the opportunistic MSN, which aims to enhance\r\nspontaneous interaction/communication among people that opportunistically\r\nencounter in the physical world, without any infrastructure support. We present the\r\nmotivation of opportunistic MSN, explore its underpinning and the key concepts.\r\nFurther, we describe our ongoing practice regarding to this emerging research area.
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