Do-follow links are highly recommended for SEO purpose because crawler will index the links which are do-follow. Once the do-follow link is indexed, it will improve the rank of the website on search engine.
List of some do-follow social bookmarking website are
Google+
Pinterest
Reddit
Tumblr.com
Examiner.com
Delicious.com
Google.com bookmarks
Citeulike.org
Blog.friendfeed.com
Digg.com
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