Dear...first of all, you have to select important PR bookmarking sites and then, bookmarks all pages of your website in proper way and also all your articles and also submit in quality blogs..
social bookmarking is very helpful to generate more traffic on your site, if you will do it in proper way.
It is a very simple and one of the best process, by which you can increase traffic on your websites. The Social bookmarking is one of the Social Media Optimization methods.
Social bookmarking is important for site traffic but if you doing social bookmarking in same IP address so it can be harmful for your site or ranking.
Benefits with Bookmarking - Quick Indexing and Visibility - Speedy indexing, relevant keywords, traffic, and quality backlinks all improve SE visibility. - Authority Links – More user bookmarks, more visitors, and more back links and more votes give you back link authority. - Keyword Rankings – Will helps to get ranking in search engines. - Increased Traffic – Also helps to get good amount of traffic through popular sites. - Page Rank – You can increase you page rank through improving of back link processing.
For me Stumble, Digg and Reditt have done good job. I recommend to bookmark each of your site page or each of your bog posts on these three sites. However, bookmarking on more n more sites will certainly generate good no of quality backlinks and expand the reach.