No thanks. I'll stick with OKCupid.
edit: since this is a YC company, I'll add some content to my criticism (even though most of this should be obvious).
1. This is a new service, and people don't know you yet. Asking them to sign up with their Facebook account is asking for too much, because there is no trust element established. Consider having a stand-alone sign-up mechanism that enables some bare-bone features with the option to hook up to Facebook for additional benefits (i.e. 5 matches per week vs. 2 matches, promise for more accurate matching, etc.). Users need to see some value out of the service before they volunteer their Facebook info.
2. Lots of people don't use Facebook, and even more of them are leaving Facebook. There are also lots of people who are cynical towards it and use it as little as possible. You are certainly alienating them by requiring a Facebook account.