1. http://latestseoupdates.com/resources/list-of-high-pr-social-bookmarking-
sites.html
http://www.webtutorialplus.com/high-pr-social-bookmarking-sites-list/
High PR 100 Social Bookmarking Sites List | SEO
http://bloggingtipstricks.com/high-pr-social-bookmarking-sites-list/
High PR Social Bookmarking 2013
http://www.how2learn.in/high-pr-social-bookmarking-2013/
High Pr Social Bookmarking Sites 15
http://www.sanumed.com/free-social-bookmarking-sites-list/
http://blogdum.com/high-pr-social-bookmarking-sites-list-seo-1436/
https://sites.google.com/site/getnewwebsitelist/latest-social-
bookmarking/dofollow-high-pr-social-bookmarking-sites-list-2013