Which is the best do follow social bookmarking website?

Bookmarking is one of the oldest way of generating backlinks and it is still working as a proven technique. Below are some good websites to use nowadays:

http://www.folkd.com/
http://digg.com/
http://blinklist.com/
http://www.bibsonomy.org/

Hope can help you

blinkbits.com
blogmarks.net
buddymarks.com
citeulike.org
del.icio.us
reddit.com
newsvine.com