VK photo wall

NSString *saveWallPhoto = [NSString stringWithFormat:@"https://api.vk.com/method/photos.saveWallPhoto?owner_id=%@&access_token=%@&server=%@&photo=%@&hash=%@", user_id, accessToken,server,photo,hash];

    saveWallPhoto = [saveWallPhoto stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSDictionary *saveWallPhotoDict = [self sendRequest:saveWallPhoto withCaptcha:NO];

http://habrahabr.ru/post/133504/