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You might want to add a demo / features page, that allows you to try the thing out, look at the main features, without having to login with Facebook.

Because I can tell you this now: No one in this crowd (tech/geek) will login with Facebook.

Exactly my first thought, I immediately bailed at the FaceBook login. Perhaps accounts outside of Facebook?

I quickly created a signup/login form, you should be able to try now