TOP FIVE SOCIAL NETWORKING SITES....

 1. FACEBOOK: 

presently Facebook is world number one social networking wesite. if we consider it as country, it will have 3rd position in the case of population.Facebook is started by Mark Zuckenberg and his friend for the use of Harvard university, then it changed as global

2. TWITTER:

The nature of twitter is entirely different from other social networking sites, it has its own style. Twitter is an online social networking service and microblogging service that enables its users to send and read text-based posts of up to 140 characters, known as "tweets". It was created in March 2006 by Jack Dorsey and launched that July.

 

3. GOOGLE +

google plus is a new social networking website, that is developed by Google corporation. google plus has it's own merits and demerits while comparing to others. 

4. LINKED IN 

Linked in is social networking website that give importance to professional relationships between persons. LinkedIn is a business-related social networking site. Founded in December 2002 and launched in May 2003 it is mainly used for professional networking. As of 9 February 2012 (2012 -02-09)^[update], LinkedIn reports more than 150 million registered users in more than 200 countries and territories.

5.MY SPACE

My space is another socail networking website that gives importance to personal relations.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 August 2011, Myspace had 33.1 million unique U.S. visitors.