Metamoderation has always demonstrated the ability to support quality, especially in the absence of identity. People lacking history or demonstrating poor behavior punish themselves and self-select in that environment.
I'm not complaining except for the fact that I'm deliberately avoiding Facebook - there are people on there I want nothing to do with and from whom I wish to isolate myself, and the utter complexity of privacy issues on Facebook further turn me off to it. I feel safer when I can dissociate my accounts across various sites, however misguided that may be. I'd like to participate on your site, as it looks interesting, but the requirement of a Facebook account is a complete dealbreaker.
Also inevitably you'd need some grouping/labeling so users can filter out/in. E.g. I'd never want any submission about cats.
What do you use for search?
Don't you want to try hosted search like IndexDen (IndexTank alternative) and move search management to our shoulders?
BTW: We're helping everyone with integration ;-)
Kind Regards http://IndexDen.com