50+ most famous social networking sites of 2011

Social networking sites is playing very big role in today’s world. Through social networking sites we are able connect to our friends and colleagues. Many people use the social networking sites for marketing also. School and college going boys and girls are so much crazy about social networking sites.

As per survey people are spending daily at-least two hours on social networking sites. Facebook and Twitter is so much popular today. Barak Obama also used social networking sites so effectively. Many political updates also we can get from social networking sites.

Llist of most famous social networking sites which are famous in 2011.