Implement it as follows
- (BOOL)peoplePickerNavigationController:
(ABPeoplePickerNavigationController *)peoplePicker
shouldContinueAfterSelectingPerson:(ABRecordRef)person
property:(ABPropertyID)property
identifier:(ABMultiValueIdentifier)identifier
{
ABMultiValueRef emails = ABRecordCopyValue(person, property);
CFIndex ix = ABMultiValueGetIndexForIdentifier(emails, identifier);
CFStringRef email = ABMultiValueCopyValueAtIndex(emails, ix);
NSLog(@"%@", email); // do something with the email here
if (email) CFRelease(email);
if (emails) CFRelease(emails);
[self dismissViewControllerAnimated:YES completion:nil];
return NO;
}