Any secrets of Bookmarking sites like Digg, Reddit etc. ?

Tweet

I always post my stories and all to diig, reddit and other sites like delicious and stumbleupon. But the main problem comes when they get un-noticed in the site. No one bothers to digg them. As a result of which I nowadays tend to feel useless to submit my sites to these social bookmarks. Is there any secret to make your post popular? Or anything else ? Share your tips here and advice me please !