As the creator of hnsummaries.com and former founder of a news summaries business, seems like a nice middle-ground would be to give the user an automated summary and then let them edit it if they choose to do so. As we moved towards this model, we were able to be much more efficient (we were doing it internally though).<p>You have a chicken-egg problem with real contributors (my guess is that you're bootstrapping the content with editors?). Am excited to see where this goes!
I don't like that I have to create an account to try it out. I realize you answered in the comments that the summaries in your demo are not real, but because of that it makes me want to try it out before I give you my email since I don't actually know how it WILL work. You should just make it installable without an account, then after it's installed encourage users to create an account for future updates (probably why you would want signups?) or more features maybe.