This is the work of the classics of psychological science - a publication that can be used as a main or additional textbook as part of a course in social psychology and seminar classes can be conducted on its basis. The book will help teachers of sociology, communication theory or business when teaching such courses as “The Impact of the Media”, “Propaganda and the Media”, “Social Influence in Small and Large Groups”, “Fundamentals of Advertising”. The book includes materials that are directly related to the problems of each of these disciplines. Designed for a student audience, the book should also be interesting and informative for graduate students - psychologists, sociologists, researchers of communication processes. The abundance of examples and methods of applying the theories outlined in it in practice will help to open up new horizons of the specialty with which you will connect your future career.