Data mining is known as Knowledge Discovery in Database (KDD), it is well-known for its powerful role in determining hidden information from wide variety of data. Data mining is used many areas and it has different mining techniques. Web content mining is a type of data mining techniques. In web content mining, social networking is a part and it is widely used. Social networking is number of people connected each other by social relationship such as friends, colleague, friends of friends for data exchange. Online social networking sites like Facebook, twitter and MySpace are among the most popular among the networking sites. In this paper, the study is related to the social networks categories and their developments in social media.