[ectoplasm]

Often people have more than one social circle. Sometimes I've met some new people because one of my friends has decided to get some people from two of their social circles together, and I'm in only one of them. Maybe you could work this into your app - I've rarely hung out with people I have no social connection to.

[friendstonight]

That's true- but I think it would've made the app even more difficult to work. Maybe it's a feature I can add when I have more users.

However FriendsTonight will show you if you have any mutual facebook friends.