Sounds like a great mix of our two majors actual needs in life : relations and fun!!!
facebook required? I'll pass, thanks.
Actually Facebook serves as an identity layer that allows to avoid people creating fakes too easily, and at the same time protect the identity of players from potential creeps - ie both players have to agree they'd like to get in touch before any contact info is revealed.
As for privacy, the default setting of the app is "me", meaning all activity from the app is invisible to your network.
we just heard about this game in japan an love it!
Thanks! This is great to hear, I hope you have fun playing, and don't hesitate to get in touch directly with me for additional feedback.