Any takers?
Edit: Okay, I am being slightly facetious in expressing how strongly I care about this.
It's a work in progress, but there are handful of cool sites that have been created so far.
Examples
http://tools.robingood.com http://self.postatic.com http://www.slackchats.com
It's an important outcome, and the OP will need to figure out what features will encourage/support popularity.
Popularity isn't just a feature - it's the single most important feature in any community-driven website.
HN, in my experience, is one of the better communities online. Trolls seem to be few and far between, and when they do show up, they're downvoted into oblivion. If you think HN is full of assholes, you're going to be sorely disappointed by most other sites too...