Recent years witnessed an ever growing impact of trust in the decision-making process within virtual communities. The inherent decentralized and open nature of such environments produced new challenges that received, up to now, little attention. For example, the individual and collective trust co-influence remains an unexplored issue. In this paper we are considering how user-centred and community-centred trust policies can be considered, managed and combined. To this aim, we propose a Socially-Compliant Trust Management Systems (SC-TMS) based on dynamic and adaptive trust policies and multi-agent technologies.