I see this more as a feature on an already established link sharing site such as hacker news or reddit than as a standalone website. Good concept, though. Please prove me wrong. EDIT: Also, I dislike the design. It's not very pretty. I'm not much of a designer myself, else I'd try to help you with it.
I don't see how it is just a feature. It is fundamentally different regarding what makes up a vote, and how things get popular.