“…With them we might be interested in sharing information that has a special value for the space-time context in which it is exchanged. We may think, for example, of tourists visiting a city (see Figure 6) who can establish a dynamic social network, through their devices, to share contents (e.g., photos but also movie critics / impressions about the tour of the city) with nearby users in real time by exploiting the physical interactions of their personal mobile devices [YCC16]. Such dynamic social networks are referred to also as Mobile Social Networks (MSN) as they depend on the mobility patterns of people in the physical world, which bring groups of people (and hence their personal devices) in the same physical locations ([ACD14], [BMD13], [YL16], [DAC2016], [XLJD16]).…”