Popular Social Networking Sites

1.Big Adda is a Indian Social Networking Site,free to create the blog as well, So many celebrities have created his blog on big Adda.
http://www.bigadda.com/

2.Facebook as the most used social network by worldwide monthly active users
http://www.facebook.com/

3.Orkut is good community to search your friends and share your photos, sending scrap.
http://www.orkut.com/

4.General Popular in India.
http://www.hi5.com/

5.LinkedIn is a business oriented social network site.
http://www.linkedin.com/

6.Tagged is also good social networking site.
http://www.tagged.com/

7.Twitter is also free social networking site.
http://twitter.com/