Digg allows you to create your own library of news stories you want to follow and also save or bury items of interest. You will find breaking news on a whole range of themes. Users can search news by images, videos and stories. It is also allows you to share news by submitting links. The Digg community can then vote and comment on these stories.
Reddit is where users can share news by posting links to content on the internet. Other users can then vote on the stories to promote them to the front page or demote them. It provides a source for what’s new and popular online.
Alexis Ohanian talks about the voting power of reddit readers.
Social Media for Learning 
