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This paper investigates how the principles underlying online social network services could be used to take advantage of node mobility in an opportunistic manner. As an example, we show how to take advantage of opportunistic contacts between mobile phones that run an online social network service. Our model includes static nodes, and mobile nodes which follow random walks. As in an online network service, we assume that each node can only communicate with a small subset of others nodes (called its mates) in addition to its geographical neighbors. Here we prove that, in such context, a simple connection scheme enables to execute sophisticated tasks (e.g., routing) and mechanisms (e.g., spatial gossip), while using only opportunistic communication and communication between mates. In other words, our results show that future online social networks can exploit mobility as long as they forget connections appropriately.

Opportunistic spatial gossip over mobile social networks