Ever since Digg announced the recent changes to their website, people have been leveraging one of its features, the shout, to spam other users. The situation is so out of control that even my old account, that has been banned, receives around 5 shouts from all my friends every day. For some time, I also though that this is a great technique to promote my stories, but I was terribly wrong. As you can see, my stories receive a lot of diggs, however they are never popular. This is because Digg uses an algorithm that looks at both diggs and buries. That’s right, if people think that your story is spam, then they will bury it. Read more at: http://www.krizka.net/2007/10/17/why-the-digg-shout-is-not-good-adverising/
Thank you! Although there has been some who have had success, short-term success, with Digg, it is overrated. That's not to say to not try it. Just don't hold your breath.
The new Digg seems to be having both lovers and haters now with the change in policy. Read the threads in this forum and you will realize that many accounts, even reputable ones are getting banned for the slightest reasons. My advice is to thread carefully and read their TOS and understand it well.