pH4Social

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Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, post links and videos, and learn more about the people they meet.

Myspace (previously styled as MySpace and My_____) is a social networking service owned by Specific Media LLC and pop star Justin Timberlake. Myspace launched in August 2003 and is headquartered in Beverly Hills, California. In June 2012, Myspace had 25 million unique U.S. visitors.

Orkut is a social networking website that is owned and operated by Google Inc. The service is designed to help users meet new and old friends and maintain existing relationships. The website is named after its creator, Google employee Orkut Büyükkökten. Although Orkut is less popular in the United States than competitors Facebook and MySpace, it is one of the most visited websites in India and Brazil. As of October 2011, 59.1% of Orkut's users are from Brazil, followed by India with 27.1% and Japan with 6.7%.

Twitter is an online social networking service and microblogging service that enables its users to send and read text-based messages of up to 140 characters, known as "tweets".

A content management system (CMS) is a computer program that allows publishing, editing and modifying content as well as maintenance from a central interface. Such systems of content management provide procedures to manage workflow in a collaborative environment.

A social network is a social structure made up of a set of actors (such as individuals or organizations) and the dyadic ties between these actors. The social network perspective provides a clear way of analyzing the structure of whole social entities.