I can add to the list the Pinterest that are now very popular. I can say i enjoy using it
and there's so many things to learn from this site.

Following are the best social networking sites
Facebook
Twitter
Linkedin
MySpace
Digg
Google+
Tagged
Orkut
Hi5
Reddit

Facebook , twitter is the best social networking sites

thanks for share
fence repair

All these social networking sites are very good.

thanks for sharing this all websites I prefer to use Facebook now.

Question about orkut... does it really that good in promoting your website?

Facebook,Twitter are My Favourite Social Networking Sites.

Most importantly, the social networking site, but really good website on your web site traffic, increase sales, depending on how you want to use the potential of.

I mostly prefer Facebook Twitter and Linkedin for bookmarking.

right ..great social networking site improve your website .....so use it..

all social site was good ,

Orkut and Hi5 are not so much used these days.

All of the above sites have a good social networking site, but it really is your site to increase traffic for the business you want to use their potential depends on how.

Facebook
Twitter
Linkedin
MySpace
Ning
Google+
Tagged