Polluting my Twitter feed with the votes from this is a total dealbreaker for me. Of everyone that follows me, only a small group of people read HN and will have heard of this. The rest of them are going to see some convoluted hashtags.

Is that your way of marketing this? It's not a bad idea in principle, but you're losing (1) non-Twitter users and (2) people like me who want to maintain their Twitter stream.