I certainly appreciate your hesitation, but we currently don't have any plans to offer other forms of authentication, simply because it would slow down the onboarding experience by at least an order of magnitude.

We want to get people meeting each other offline as quickly as possible (not filling our laborious questionnaires) and Facebook really helps to lower that friction.

"we currently don't have any plans to offer other forms of authentication, simply because it would slow down the onboarding experience by at least an order of magnitude."

I think you are overestimating both the time required to fill out a questionnaire and the reluctance of people to do so.

I think I speak for a lot of people when I say that people generally don't want any chance of their online dating lives to intersect with their social media profiles. The peace of mind of knowing that there is no interaction between a dating site and their Facebook newsfeed is enough to justify filling out a few duplicate questions.

To a large portion of their audience, that's a feature rather than a bug. Not so much that their information is opened, but rather that they have assurance the human beings they're meeting have real friends.

I'll echo the sentiment and I've been a huge Facebook Platform advocate. Here is the "application" screen (with fields filled in) after you allow Facebook access: http://i.imgur.com/XQyQy.jpg

Surely having an option to manually fill in those fields (with the addition of asking email/password/name) instead of pulling from the Facebook API is within reason.