The problem of regulation of social behaviour has been studied of social representations of modern youth. The authors consider that the mechanism of trust can be seen as the basic principle for constructing relations. This article covers issues related to social representations of trust, manifestations of credulity, direction and basic functions of trust. About 380 people have become the subject of the study: 190 men and 190 women aged between 20 and 30 (the average age being 23.78). The study used the following tools: A questionnaire, the authors’ modification of Sachs and Levy’s Sentence Completion Test and the “Trust Situation” projective technique. The data-processing included content analysis, correlation and factor analysis. The results enabled us to create a classification of people based on differences in perception of the trust phenomenon, trust situations, objects and basic functions of trust. The phenomenon of “trust blindness” has been identified and described for the first time.