1. http://www.slideshare.net/Swathi_C_H/timeline-of-social-networking-sites
2. http://www.webdesignerdepot.com/2009/10/the-history-and-evolution-of-social-media/
3. http://www2.uncp.edu/home/acurtis/NewMedia/SocialMedia/SocialMediaHistory.html
4. Social networking sites:Definition,History and Scholorship by Nicole Bellison by Department of Telecommunication,Michingan University
5. http://in.linkedin.com/in
6. www.facebook.com
7. www.twitter.com
8. http://sapost.blogspot.in/2013/06/the-advantages-and-disadvantages-of.html
9. Pettenati, M. C., Cigognini, E., Mangione, J., Guerin, E. (2007, July). Using social software for personal knowledge management in formal online learning. Turkish Online Journal of Distance Education-TOJDE , 8(3), article 3. Retrieved December 16, 2007, from http://tojde.anadolu.edu.tr/tojde27/articles/article_3.htm.
10. Williamson, D. A. (2006, July 25). Hooking Up With Social Networks. Retrieved December 16, 2007, from http://www.emarketer.com/Article.aspx?id=1004079