Digg is a very popular Social Bookmarking site that can be found at Digg.com. You can Digg articles that you like and that draw your attention. This is a very successful social bookmarking site and it can bring you a lot of traffic. To digg any article on this website, look below this post for a few 16×16 picture list in a long horizontal lines containing a few social bookmarking sites. Hover your mouse over any picture and you will see where each belongs. The left most one should be for Digg. Click it to digg this article if you like the info.
You can also submit your own articles there. Just sign up, log in, then submit your article url along with title and category. This can help you out a lot if done properly. Just make sure to write a very well informed article that helps others. Good luck!