This looks like an interesting and useful service for people who are willing to give all the relevant information to Facebook. It seems like creating a Facebook account with all of this information would be a lot more work than just providing it to the dating site directly, though.
> Wednesday Night would like to access your [Name, profile picture, age range, gender, language, country and other public info], friend list, email address, birthday, work history, checkins, education history, hometown, interests, current city, photos, religious and political views, personal description and likes.