Dear all... Can we share best websites for profile backlinks high PR. Few are :

http://www.listio.com/
http://url.org/
https://flattr.com
http://free.yudu.com
http://www.authorstream.com/
http://www.widgetbox.com

Waiting for your lists. Please donot copy-paste the data from the searches. I already checked many websites for profile backlinks added in the blogs. Either these are nofollow or registration closed.