Bio-Network.org

"Bio-Network.org is a network for scientists and the community to discover and share scholary and popular content in biology, in the applied life sciences agriculture, horticulture and forestry, in the earth sciences, and in the environmental sciences".

The users are invited to vote on the bookmarks of research papers and science feeds. You could easily see how many digs each research paper or feed has gotten. To be able to dig you have to register and make a username and password.