Influence of the industry of social networks on a modern life is conclusive, and at the moment social networks ýâîëþöèîíèðóþò in the most significant image - they move to a new category of networks - to Social Networks of version 3.0 (Social Networks 3.0).

The first social networks <http://www.social-networking.ru/history/6/> have appeared in the middle of 90th years and gave users initial opportunities for dialogue, is similar eGroups/OneList, ICQ, Evite. Such network services as a rule are not considered(examined) in quality social networks, but nevertheless they are that base on which further online - services for dialogue and  users developed.

Social networks 2.0 have appeared in the beginning of 21-st century when businessmen have understood in effect social networks and were defined(determined) with those broadest opportunities which give social networks for all fields of activity. Services similar Friendster, Tribe, Orkut, LinkedIn, Spoke have allowed to create social networks for rest and for job. Differently, at that time founders of social networks worked more likely for the sake of networks and their development, rather than for the sake of use of opportunities given as these networks.

Nowadays we have entered a third epoch of social networks. After euphoria of participation for the sake of participation, present networks become the working tool, and, moreover, the necessary tool for conducting activity, whether it be business or creativity. Social networks serve as a platform for informal dialogue of friends is similar LiveJournal. Social networks help to create new music as MySpace. Social networks expand game experience of mass online - games in network Xfire. Social networks serve as the serious tool for search of employees and partners in LinkedIn.

Thus, social networks are a key element for the further development of communities and shortly they will be the integral tool for any activity.