Digg reads the posts that you, well, digg as news articles, and that’s how it classifies them under. You can also create a short description of that blog entry there, as well as assign it under the categories that can be found on the site. Digg then automatically saves it on their system, and if users find your post interesting, they’ll also digg it. Keep in mind: most of the highly dugg entries are good ones, so be sure to make your posts as interesting and as informative if you want these to have high rankings. 

Del.icio.us, on the other hand, installs a toolbar on your Internet browser, so if you find an interesting blog entry that you really like, you can add it to the site’s system simply by clicking on the button.

We hope that helped!