Scott Karp tells you why your article never makes it to the Digg homepage:
“As with everything else, it’s all about who [you] know. Digg, to its credit, is fundamentally social. The success of Digg users in getting stories to the homepage presents as a long tail in no small part because of the power of Digg’s social network, and the ability of top diggers to work the network.”
So, social media is just like the social structure of high school: you can’t just show up wearing a cool Benetton outfit, and assume everyone will like you. You have to build your network. But I am sure the Benetton doesn’t hurt.