how to share stuff to social networks with UIActivityViewController

share.m

-(void) sharePicture {
    NSString *textToShare = @"Check out this picdoodle that I created.";
    UIImage * image = [self getPicture];
    
    NSArray *objectsToShare = @[textToShare, image];
    
    UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:objectsToShare applicationActivities:nil];
    
    NSArray *excludeActivities = @[UIActivityTypeAirDrop,
                                   UIActivityTypePrint,
                                   UIActivityTypeAssignToContact,
                                   UIActivityTypeAddToReadingList,
                                   UIActivityTypePostToVimeo];
    
    activityVC.excludedActivityTypes = excludeActivities;
    
    [self presentViewController:activityVC animated:YES completion:nil];
}