Digg is a social network that its topics is especially about science and technology, it is like a democratic  web side were it allows you to put a post on whatever topic you want, it checks like the points of the post by the help of the users that vote on the post.

Function: if there is many persons that vote for your post, it will appear in the front page, it also allows you to publish a story, with the launch of Digg 3.0 in june/26 has been divided in 6 cathegorys: Technology, Science, World and bussines, Videos, Entertainment, Games,