I think that the sharedly plugin by Shyam Somanadh could do what you're looking for
Thank you Susan I will try it out.
The Fivestar plugin adds the possibility to rate discussion topics, bookmarks, blogs and file uploads (and some other things like tidypics pictures and izap_videos videos for example). This should allow your members to rate others' stories and links if they get added in the most likely ways.
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