web designer and Blogger Tips: Digg adds nofollow to some लिंक्स
You Can Take Knowledge Here About SEO
Why digg add rel="nofollow" tag with some external link. Actually digg this done after consultation with SEO/SEM and link spam field’s leading experts. But don't worry digg add rel=”nofollow” tag to only external link that are suspicious.
This includes all external links from comments, user profiles and story pages below a certain threshold of popularity. Abuse( for example link spamming ) was a big problem for Digg team ,Actually many digg user add hyper link to their site in comment,user profiles and story pages to get advantage of link back or to get popularity.But at some time its only link spamming.