Social Internet of Things (SIoT) has become a hot topic in academic research, which employs the theory of social networks into the different levels of the Internet of Things (IoTs) and has brought new possibilities for the development of the IoTs. Essentially, the SIoT is a subset of IoTs, using intelligent hardware and human as the node, social network as the organization type, the social relationship between things, things, and humans, between humans, formatting research methods and models with social network characteristics, to realize the connection, service and application of the IoTs. Moreover, SIoT is a form of realization of technology, architecture, and application of the IoTs using social network research methods, and further promotes the integration between real world and the virtual cyberspace, contributes the realization of the IoTs, expands the research scope of the social networking, and provides a new solution for the specific problems of the IoTs. Consequently, there is a tremendous need for researchers to have a comprehensive knowledge of the advances in SIoT. This special issue is soliciting scientific research papers that can present a snapshot of the latest research status of SIoT.