The combination of Internet of things and the social network make it possible for us to interact with environment and other people, this leading to the social Internet of things concept. In order to expand the idea of human to human connectivity to include everything in the real world, a suitable social model acts as a key factor to expand basic communication functionalities to include services discovery, push messages, subscribe channels and execute orders. Existing solutions do not mention about the relationships between entities or limit the relationships within the physical entities range. In this paper we propose a social model of Internet of things to organize everything in the physical world including both entities and human. And a smart environment prototype including sensors, hardware middleware, cloud server, social network platform, mobile clients along with service discovery functions and reminding functions.