Facebook login. Cannot use. :(
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.