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.
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.
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.
Why not replace "all guys, and especially single women" with something more neutral like "people who don't like pink". I'm a guy and I don't hate valentines day.
For instance, why do you need to know if i'm interested in guys or girls if the matching is, for now, always the same (3 guys 3 girls).
Why do you need my phone number? What would you ever use it for?
It seems likely from the format of the information that some of it will be shared with whomever I'm matched with. What information do you give them exactly?
Something like giving out your phone number, especially if it's not optional, makes me much more careful about signing up somewhere.
