Estoy usando facebook sdk para publicar en el muro de un amigo. Puedo publicarlo, pero cuando selecciono varios amigos en FBWebDialog en lugar de publicar dos amigos simultáneamente para cada amigo, se muestra un cuadro de diálogo separado. Cómo publicar en el muro de varios amigos.

-(void)showFriendsList
{
    friendPickerController = [[FBFriendPickerViewController alloc] init];
    friendPickerController.title = @"Pick Friends";
    friendPickerController.delegate = self;
    [friendPickerController loadData];
}

-(IBAction)facebookShare:(UIButton *)sender
{
    [friendPickerController presentModallyFromViewController:self animated:YES handler:
     ^(FBViewController *sender, BOOL donePressed) {

         if (!donePressed)
         {
             return;
         }

         NSString* fid;
         NSString* fbUserName;

         for (id<FBGraphUser> user in friendPickerController.selection)
         {
             NSLog(@"\nuser=%@\n", user);
             fid = user.id;

             fbUserName = user.name;

             NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:remedyLabel, @"caption", appIcon, @"picture",symptomName, @"name",remedyDescription,@"description",fid,@"tags",fid,@"to",@"106377336067638",@"place", nil];

             NSLog(@"\nparams=%@\n", params);

             [FBRequestConnection startWithGraphPath:[NSString stringWithFormat:@"%@/feed",fid] parameters:params               HTTPMethod:@"POST" completionHandler:^(FBRequestConnection *connection,id result,NSError *error)
              {
                  [FBWebDialogs presentFeedDialogModallyWithSession:nil                                                     parameters:params  handler:^(FBWebDialogResult result, NSURL *resultURL, NSError *error)

                   {
                       if (error)
                       {

                           NSLog(@"Error publishing story.");
                       }
                       else
                       {
                           if (result == FBWebDialogResultDialogNotCompleted) {
                               // User clicked the "x" icon
                               NSLog(@"User canceled story publishing.");
                           }
                           else
                           {

                               // Handle the publish feed callback

                               //Tell the user that it worked.
                               NSLog(@"Request Sent");
                           }

                       }
                   }];
              }];

         }

     }];
}