In pervasive environments, services are fastly developing and are being deployed everywhere. In this article, we introduce a Servicebook, a new social network of services, where services create and join group of service profile providing to users better access to all the services in their vicinity. We propose a novel technique to realize this Servicebook, the user-excentric service composition. This user-excentric composition relies on two service relations: the compatible relation and the composition relation. We developed and evaluated an OSGi-prototype as a proof-of-concept.