  In the paper, the model of the society represented by a social network and
the model of a multi-agent system built on the basis of this, is presented. The
particular aim of the system is to predict the evolution of a society and an
analysis of the communities that appear, their characteristic features and
reasons for coming into being. As an example of application, an analysis was
made of a social portal which makes it possible to offer and reserve places in
rooms for travelling tourists
