The paper proposes a Trustworthy Service Evaluation (TSE) system for service-oriented mobile social networks, allowing users to share service reviews directly without third-party oversight. It introduces mechanisms to address linkability, rejection, and modification attacks, ensuring review integrity and authenticity through cooperative user participation and a system called Sybil-resistant TSE (SRTSE) that detects Sybil attacks effectively. Performance evaluations show that the proposed system outperforms existing review systems in terms of submission rates and delays.