This is great but...
Systems like Hacker News are great because they are relatively unknown. When a system like this takes off, it puts a lot of pressure on moderation of its source. Is dang ready to moderate an influx of comment spam?
Not a criticism at all... just that we're going to see this happening all over the place. It's become very easy to scrape data and launch something. If you are a source for an audience, people will start to game your thing.