We're in the process of building an recommendation system so people in the community can invite new contributors (a la dribbble). Here's a screenshot: https://twitter.com/rrhoover/status/480377375192932352
Thanks for your patience and sorry again to limit access but we're working to open it up!
IMHO, a good way to do the comments would be to focus on Q&A with the founders (or someone affiliated with the product) address the question. As a visitor I would like to easily be able to see which questions have been answered instead of scrolling around to piece together the conversation.
Certainly looking forward to seeing what you have planned for PH.
I'm actually testing threaded comments in staging right now (might release today) and soon after we are adding a "badge" next to the founder's name so that it's clear who made it.