Using Social Media can be a disappointing experience. Especially with Digg.com. The Digg community has earned itself the reputation of being very strict with their submission guidelines. If they sense that you might spamming, they bury your post quicker than you would know and your whole account could be seized (deactivated) overnight.
Just do a search on Google, Yahoo, or MSN for banned by digg to see the magnitude of that issue.