Social Bookmarking Submission is the first step of building backlinks. It will give immediate traffic and at the same time, build a lifetime backlinks to your websites.
If you want a complete, tested Dofollow Social Bookmarking Sites, here’s the list that you are looking for:
not so many Bookmarkeing sites yet there ist a Pagerank included so you can easily see what seem to be the most relevant or popluar Bookmarking Sites on the net.
Although search engines provide a great starting point when you're searching for someone online, with all of the new social sites that have popped up over the past few years, they're often just not enough.