According to Nicole B. Ellison and Danah M. Boyd in their article on “Social network sites: Definition, History, and Scholarship”, they defined Social Networking Sites as “Web-based services that allow individuals to (1) Construct a public or semi-public profile within a bounded system, (2) Articulate a list of other users with whom they share a connection, and (3) View and traverse their list of connections and those made by others within the system”( 2007). In other words, Social Networking Sites (SNSs) are websites that are designed to simplify communication between users who share similar activities, attitudes and interests. Today the growth and role of social networking sites has become an issue not only for the users themselves but also for scholars and industrial researchers. My aim in this research will be to explore Social Networking Sites in general. The concept of Social Networking Sites is very broad; therefore my main study will be dealing primarily with how privacy and restrictions plays a role in identity management with reference to Facebook.