"Digg is going social in the most radical way possible. Today, Digg is a list of stories in descending popularity that were submitted by users (or, often as not, the publications themselves), and when you go to Digg.com, that's what you see: a list of stories. The new Digg won't look anything like that. Instead, it'll tap into your other social streams, figure out what you like, and present those stories to you in a personalized homepage. And since you can pick tags that interest you ("green," "design," "Apple"), Digg will have a pretty good idea what you like. That homepage, by the way, is what you'll see when you go to Digg.com--there'll still be a link for popular stories over in a corner somewhere, but popularity is taking a backseat to personalization.
"If you want to take advantage of this new personalization, you'll have to give Digg access to your Facebook feed through Facebook Connect, your Twitter, and your OpenID. Digg will then look through all that data, match up your interests with stories already in its system, and pop them into your personal Digg homepage."