Self-adaptability and spontaneous configuration are necessary features for emerging and future pervasive service systems. SAPERE (``Self-aware Pervasive Service Ecosystems'') is a general framework aimed at facilitating the decentralized deployment, execution, and management, of self-organizing and self-adaptive pervasive computing services. In this paper, we firstly present the overall rationale underlying SAPERE, and its reference conceptual architecture. Following, we sketch the middleware infrastructure of SAPERE, and detail the specific coordination model implemented by it, based on a limited set of ``eco-laws". Finally, we show how, via the SAPERE eco-laws, it is possible to express and easily program a variety of general-purpose social applications.