The point where I became hesitant and backed out was when it showed my picture and said you wanted my public profile, friend list and email address. Why would this site need my friends list?
Please people, stop requiring users to login to learn about your application or service. Why are you putting a giant hurdle at the front door? Signing up should be the very last step. For example, let me setup a Webbify page, and if I want to save it, I need to create an account. At that point, I'm invested, I'm much more likely to register.
I suspect that this might change when there's some massive security breach that causes a big publicly visible compromise (millions of friend lists get abused/compromised by some rogue bot targeting loads of apps using Facebook as just a single sign-on provider), and it'll get changed.
I've had a couple of MVP apps I've demoed to people, wanting to use FB as a SSO, and get quite a bit of "DAMN YOU - YOU'RE NOT GETTING MY FRIEND LIST! YOU DON'T NEED IT!" You're right, I don't. Tell Facebook. I don't want it.