The lecture will concern dynamics of two different processes occurring in social networks: the flow of information and the process of evaluation. Similarities and differences in how networks structure shapes the spread of information and governs social influence in the process of evaluation will be discussed. Research in social psychology suggests that information is not only acquired but also evaluated and interpreted in the process of interaction, as individuals construct common social representation. Both simulation and empirical data show that transmission of information and evaluations operate in a very different ways. Empirical data concerning the structure of selected social networks and dynamics of information on the networks will be presented.