get actual user photo (profile picture) by user id from Vkontakte, Twitter, Facebook

getUserPicture.m

// get actual user picture from VKONTAKTE by UID
- (void)getUserPictureVK:(NSString*)uid
{
    NSString *requestURLstring = [NSString stringWithFormat:@"https://api.vkontakte.ru/method/getProfiles?uid=%@&fields=photo", uid];
    NSURL *requestURL = [NSURL URLWithString:requestURLstring];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:requestURL];
    [request setTimeoutInterval:10];
    
    AFJSONRequestOperation *operation = [AFJSONRequestOperation operationWithRequest:request 
                                                                             success:^(id JSON) {
                                                                                 DLog(@"JSON OK");
                                                                                 [self setupVKphoto:JSON];

                                                                             }
                                                                             failure:^(NSError *error) {
                                                                                 DLog(@"JSON FAIL: %@", error);                                                                                 
                                                                             }
                                         ];
    
    NSOperationQueue *queue = [[[NSOperationQueue alloc] init] autorelease];
    [queue addOperation:operation];
}

- (void)setupVKphoto:(id)JSON
{
    // in VK world user dict inside dict and inside array
    id obj = [JSON valueForKeyPath:@"response"];
    if([obj isKindOfClass:[NSArray class]]) {
        NSDictionary *userData = [NSDictionary dictionaryWithDictionary:[obj objectAtIndex:0]];
        NSString *userPhotoUrlString = [userData valueForKey:@"photo"];
        DLog(@"user photo: %@", userPhotoUrlString);        
    }
}

// get actual user picture from TWITTER by screen_name
- (void)getUserPictureTW:(NSString*)screenName
{
    //also http://api.twitter.com/1/users/profile_image/twitterapi.json
    NSString *userPhotoUrlString = [NSString stringWithFormat:@"http://api.twitter.com/1/users/profile_image?screen_name=%@&size=normal", screenName];
    DLog(@"user photo: %@", userPhotoUrlString);
    
}

// get actual user picture from FACEBOOK by username
- (void)getUserPictureFB:(NSString *)username
{
    NSString *userPhotoUrlString = [NSString stringWithFormat:@"https://graph.facebook.com/%@/picture",username];
    DLog(@"user photo: %@", userPhotoUrlString);
}

Fcebook one not possible anymore, requires a token: https://developers.facebook.com/docs/graph-api/reference/v9.0/user/picture