The leader in social news, where users determine what's important and interesting by submitting it, "digging" it and posting a comment. Click "Top in 24 Hours" to see the most popular articles, blog posts and other Web pages of the day. In recent months the site has expanded beyond tech news, adding separate sections for Science, World & Business, Sports, Entertainment and Gaming. Digg Labs continues to roll out new and visually interesting ways to view the links and find out immediately what's hot (and what's not). On BigSpy, stories pop up at the top each time they get another digg, the moment they get it. The bigger and bolder the headline, the higher the digg count. Arc, meanwhile, arranges stories in a circle; mouse over a piece of the pie to preview the link.