Social Network

Well. I'm going to explain the social network.
In the first plane, what is a social network?
A social network is an online communication platforms, a new way of representing a social structure.
What is its utility?
It depends on the social network, each has a different type of operation and a different style to create their social network but all attempts to achieve the communication between people or groups of people.
There are many different types of social networks, a charge basically the newest as "Instagram" dedicated to storing photos that are uploaded by each persons different profiles chat between people online, and even some for "his friends" the can view.