The rapid growth of Social Networking Sites (SNSs) as business platforms for individual or small sellers recognised trust as the main important role in determining the successful execution of their business operation. Current trust model focused in business sellers by considering website as one of the trust factors. However, these model are not applicable for SNSs environment. Based on the identified factors affecting trust in SNSs environment, this paper proposed a fuzzy-based trust model to evaluate customers' trust based on their perception and experiences. The evaluation model was then tested to validate its efficiency in evaluating trust level.