- (void)viewDidAppear:(BOOL)animated
{
    [PFFacebookUtils initializeFacebook];
    [PFTwitterUtils initializeWithConsumerKey:@"HIDDEN"
                               consumerSecret:@"HIDDEN"];

    // Check if user is logged in
    if (![PFUser currentUser]) {
        // Instantiate our custom log in view controller
        MyLogInViewController *logInViewController = [[MyLogInViewController alloc] init];
        [logInViewController setDelegate:self];
        [logInViewController setFacebookPermissions:[NSArray arrayWithObjects:@"friends_about_me", nil]];
        [logInViewController setFields:PFLogInFieldsUsernameAndPassword

         //| PFLogInFieldsTwitter
         | PFLogInFieldsFacebook
         | PFLogInFieldsSignUpButton
         | PFLogInFieldsDismissButton];

        // Instantiate our custom sign up view controller
        MySignUpViewController *signUpViewController = [[MySignUpViewController alloc] init];
        [signUpViewController setDelegate:self];
        [signUpViewController setFields:PFSignUpFieldsDefault | PFSignUpFieldsAdditional];

        // Link the sign up view controller
        [logInViewController setSignUpController:signUpViewController];

        // Present log in view controller
        [self presentViewController:logInViewController animated:YES completion:NULL];

    }

    [super viewDidAppear:animated];
    self.canDisplayBannerAds = YES;
}

// Sent to the delegate when a PFUser is logged in.
- (void)logInViewController:(PFLogInViewController *)logInController didLogInUser:(PFUser *)user {
    [self dismissViewControllerAnimated:YES completion:NULL];
}

// Sent to the delegate to determine whether the log in request should be submitted to the server.
- (BOOL)logInViewController:(PFLogInViewController *)logInController shouldBeginLogInWithUsername:(NSString *)username password:(NSString *)password {

    // Check if both fields are completed
    if (username && password && username.length != 0 && password.length != 0) {
        return YES; // Begin login process

    }

    [[[UIAlertView alloc] initWithTitle:@"Missing Information"
                                message:@"Make sure you fill out all of the information!"
                               delegate:nil
                      cancelButtonTitle:@"ok"
                      otherButtonTitles:nil] show];
    return NO; // Interrupt login process
}

// Sent to the delegate when the log in attempt fails.
- (void)logInViewController:(PFLogInViewController *)logInController didFailToLogInWithError:(NSError *)error {
    NSLog(@"Failed to log in...");
}

// Sent to the delegate when the log in screen is dismissed.
- (void)logInViewControllerDidCancelLogIn:(PFLogInViewController *)logInController {
    [self dismissViewControllerAnimated:NO completion:nil];
    //[self.navigationController popViewControllerAnimated:YES];

    [[[UIAlertView alloc] initWithTitle:@"Log In Required"
                                message:@"Please Make Sure You Log In, Or Sign Up As A New User!"
                               delegate:nil
                      cancelButtonTitle:@"ok"
                      otherButtonTitles:nil] show];
}

// Sent to the delegate when a PFUser is signed up.
- (void)signUpViewController:(PFSignUpViewController *)signUpController didSignUpUser:(PFUser *)user {
    [self dismissViewControllerAnimated:YES completion:nil]; // Dismiss the PFSignUpViewController

}

// Sent to the delegate when the sign up attempt fails.
- (void)signUpViewController:(PFSignUpViewController *)signUpController didFailToSignUpWithError:(NSError *)error {
    NSLog(@"Failed to sign up...");
}

// Sent to the delegate when the sign up screen is dismissed.
- (void)signUpViewControllerDidCancelSignUp:(PFSignUpViewController *)signUpController {
    NSLog(@"User dismissed the signUpViewController");
}

2014-07-23 14:53:30.528 WeddingsAndMore[985:60b] {
    NSLocalizedFailureReason = "com.facebook.sdk:SystemLoginCancelled";
    "com.facebook.sdk:ErrorInnerErrorKey" = "Error Domain=com.apple.accounts Code=7 "The Facebook server could not fulfill this access request: Invalid permission: friends_about_me" UserInfo=0x17026b700 {NSLocalizedDescription=The Facebook server could not fulfill this access request: Invalid permission: friends_about_me}";
    "com.facebook.sdk:ErrorLoginFailedReason" = "com.facebook.sdk:SystemLoginCancelled";
    "com.facebook.sdk:ErrorSessionKey" = "<FBSession: 0x17813cca0, state: FBSessionStateClosedLoginFailed, loginHandler: 0x0, appID: 52610783371, urlSchemeSuffix: , tokenCachingStrategy:<PFFacebookTokenCachingStrategy: 0x1780319e0>, expirationDate: (null), refreshDate: (null), attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(null)>";
}

NSLocalizedFailureReason = "com.facebook.sdk:SystemLoginError";
    "com.facebook.sdk:ErrorInnerErrorKey" = "Error Domain=com.apple.accounts Code=7 "The Facebook server could not fulfill this access request: Invalid application <redacted>" UserInfo=0x170273040 {NSLocalizedDescription=The Facebook server could not fulfill this access request: Invalid application <redacted>}";
    "com.facebook.sdk:ErrorLoginFailedReason" = "com.facebook.sdk:SystemLoginError";
    "com.facebook.sdk:ErrorSessionKey" = "<FBSession: 0x178125c80, state: FBSessionStateClosedLoginFailed, loginHandler: 0x0, appID: <redacted>, urlSchemeSuffix: , tokenCachingStrategy:<PFFacebookTokenCachingStrategy: 0x17003de60>, expirationDate: (null), refreshDate: (null), attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(null)>";
}

NSLocalizedFailureReason = "com.facebook.sdk:SystemLoginCancelled";
    "com.facebook.sdk:ErrorInnerErrorKey" = "Error Domain=com.apple.accounts Code=7 "The Facebook server could not fulfill this access request: An unknown error occurred" UserInfo=0x17027c8c0 {NSLocalizedDescription=The Facebook server could not fulfill this access request: An unknown error occurred}";
    "com.facebook.sdk:ErrorLoginFailedReason" = "com.facebook.sdk:SystemLoginCancelled";
    "com.facebook.sdk:ErrorSessionKey" = "<FBSession: 0x1781366c0, state: FBSessionStateClosedLoginFailed, loginHandler: 0x0, appID: 6565656656565, urlSchemeSuffix: , tokenCachingStrategy:<PFFacebookTokenCachingStrategy: 0x17003a700>, expirationDate: (null), refreshDate: (null), attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(null)>";