Social Bookmarking is one of the oldest and easiest way to create backlinks to your website. Create accounts with all the top social bookmarking sites and then bookmark your favorite websites (in this case bookmark your own blog posts or your own websites) to help spread out the amount of backlinks going to your website.
These Social Bookmarks provide both SEO backlinks and traffic to your website/blog. One important thing to remember is that not all bookmarking sites are good. Choose only high PR sites to bookmark your links. It is best practice to create these bookmarks in small batches to avoid any Google penalties.
You can also outsource this task for cheap at Fiverr.
Please share your favorite bookmarking site with us in comments.