Getting friends on facebook's scores from parse - ios

Question

So I finally got my app letting users sign into Facebook and parse. Lets call my app a game even though it isn't and lets say that I upload the newest score someone gets every time they play the game. So what I have done is uploaded the "score" to parse under the user. Now, I want the user to be able to see friends that are on Facebook's score. So, I have the user signed in and now how can I check if their friend is using my "game" and then match their email with the one on parse to get there score? As of now, I can get the friends id's of the user that signed in.
BTW. the user has to sign into facebook and make a parse account for my app
I know I am gong to have to use a query to get stuff from parse, I guess my main question is How do I get the facebook users email?
This is how I am getting their id :
- (void)getFacebookInfo {
[FBRequestConnection startForMeWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (!error) {
// Set user's information
NSString *facebookId = [result objectForKey:#"id"];
NSString *facebookName = [result objectForKey:#"name"];
if (facebookName && facebookName.length != 0) {
[[PFUser currentUser] setObject:facebookName forKey:#"displayName"];
}
if (facebookId && facebookId.length != 0) {
[[PFUser currentUser] setObject:facebookId forKey:#"facebookId"];
}
[[PFUser currentUser] saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
// Get user's friend information
[FBRequestConnection startForMyFriendsWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (!error) {
NSArray *data = [result objectForKey:#"data"];
NSMutableArray *facebookIds = [[NSMutableArray alloc] initWithCapacity:data.count];
for (NSDictionary *friendData in data) {
[facebookIds addObject:[friendData objectForKey:#"id"]];
}
[[PFUser currentUser] setObject:facebookIds forKey:#"facebookFriends"];
[[PFUser currentUser] saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
// We're in!
NSLog(#"%#", facebookName);
[self dismissViewControllerAnimated:YES completion:NULL];
}];
} else {
[self showErrorAlert];
}
}];
}];
} else {
[self showErrorAlert];
}
}];
}

Answer 1

In order to get the email address of the Facebook user within the completion handler of startForMyFriendsWithCompletionHandler use:
[FBRequestConnection startForMyFriendsWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (!error) {
NSArray *data = [result objectForKey:#"data"];
for (NSDictionary *friendData in data) {
//This is each friend's email address
NSString *aFriendsEmail = [friendData objectForKey:#"email"];
}
}
}];