The rankings are made out of the interactions with the content. Currently we calculate the ranking with the obvious interactions like hits, votes, comments and

The rankings are made out of the interactions with the content. Currently we calculate the ranking with the obvious interactions like hits, votes, comments and the number of 'tag a friend'. At the moment you can see the sources in every article. We show you who published an specific article. But you are right - we should implement a detail page where we show you all sources we use.