Communication is the basis of the human society; Internet has contributed to that in recent decades. Mass interconnection of people by means of social networks is a phenomenon of recent years. The purpose of my thesis was to map the situation in the area of the use and development of social networks, advantages and disadvantages in the area of communication, their development and their future. In my analysis, I also dealt with possible ways of using these networks in business. Two surveys have become the basis of my evaluation. The survey in the field of consumer market evaluated the extent and orientation of the use of social networks by people in the Czech Republic; the other one concentrated on business entities and mapped the way how co...