Social networks are one of the most studied structures in the area of exchange of information and knowledge. Even in the field of education, it is possible to find examples of their formal or informal existence and it therefore makes sense to think about their deeper investigation and possibilities for understanding of ongoing processes and potentially also for teaching support. This contribution shows the application of multi-agent heuristic model of social network informally existing in the group of students of the same course which main purpose is the exchange of knowledge. Anylyzed will be particularly the dynamics of relations in several model situations.