You could get rid of Facebook signup but incentive your users after the signup to connect their Facebook account for "a better matchmaking" and to not meet thei

You could get rid of Facebook signup but incentive your users after the signup to connect their Facebook account for "a better matchmaking" and to not meet their friends or grandma. It I would also suggest them to import all of their social accounts (instagram, pinterest, twitter) which makes sense since your role as a matchmaker is to gather informations as much as you can.