Help with Facebook bundleID for iOS and keystore for Android

I have followed directions and performs all steps described in: https://coronalabs.com/blog/2013/07/30/understanding-facebook-authentication/#comment-609863

For IOS, I have done everything stated in the blog post. In my Facebook portal for my game, I am being prompted to enter a BundleID. Where can I find this for an iOS build?

For Android, I have created a new keystore for my App (based upon directions in the blog) and successfully uploaded my first APK from my Corona Android Build using this keystore. I then successfully uploaded the APK to the GooglePlay store in Beta. Two questions: Why in the blog does Rob (Corona superstar staff) instruct us to create a keystore for our App and then follow it immediately with instructions to use keytool on a different, debug keystore? So, how can I create a keyhash for my App’s keystore, rather than the debug keystore?

Because the blog post was created before Facebook v4, am I missing something else?

I have migrated to Facebook v4 based upon these details: https://docs.coronalabs.com/plugin/facebook-v4/migration.html