Multiple apps are using the same FaceBook Single Sign-On account, how to choose which one opens the login screen?

There's some specific changes that need to be made to support multiple IOS apps using the same Facebook app ID with the Single Sign-On Authentication

See https://developers.facebook.com/docs/howtos/share-appid-across-multiple-apps-ios-sdk/ for more information.

The most important things to check are:

• Do you have the URL Scheme suffixes defined? (ie fb1234free:// instead of fb1234://)
• Do you have those suffixes defined in the developer app in the order you want Facebook to use them?