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Social features are affecting different application areas, from traditional online social networks to economical networks, as well as the study of epidemical behaviors of pandemics and diseases. From the information point of view also, the Internet paradigm has been revised according to social behaviors of nodes, showing intrinsic properties that have allowed the definition of the Social Internet of Things paradigm. Furthermore, considering vehicular networks, social features have been spreading their influence, and have defined the concept of vehicular social networks, where mobile nodes show predictable social behavior. In this context, networking concepts should be updated accordingly, taking into account node social aspects and interactions. In this article, we discuss the open challenge of how to define a trust vehicle, relying on social networking aspects. We introduce the concept of node trustworthiness in a …