Dofollow social bookmarking sites can play a very vital role in improving search engine position of your site and your blog posts. The high page rank dofollow social bookmarking sites can also help you to improve the page rank of any site.Google page rank is not regularly getting updated for last few years, but it is always good to be ready with quality backlinks. Not to forget the amount of traffic these social bookmarking sites can send you on a regular basis. There are a number of advantages to submitting your content to one of these sites. For one thing, they help to increase your brand awareness.