This paper discusses the engineering of communities of Web services with emphasis on the social interactions that arise between these Web services and hence, can put some restrictions on their behaviors. Like service parks, communities gather Web services that offer similar functionalities to users. The social interactions between Web services take place within and across communities and are captured using structures known as social networks. Five types of networks are established during this engineering, which are supervision, competition, substitution, collaboration, and recommendation. Above these networks mining operations are performed, which results in assigning social attributes to Web services such as selfishness, fairness, and unpredictability. Details on the experiments are, also, reported in this paper. © 2011 IEEE.