Social Bookmarking is one of the easiest ways to boost your backlinks. Just make sure that all social bookmarking sites are in different IP's if not search engines will penalize your Links. That's why I will submit your URL to 80 Social Bookmarking sites each with a UNIQUE IP. I will make most social Bookmarks unique and Drip Feed them for 10 days. I'm the ONLY one who gives 100% Dofollow links.
Nofollow = Noworth. All others give 90%+ nofo||ow.