title: iOS Facebook Open Graph API how to set a "reference" property type
body: <p>I am trying to post an action</p>
  
  <pre><code>    NSMutableDictionary *params = [[NSMutableDictionary alloc] initWithCapacity:5];
      [params setObject:[self getHomePageTitle] forKey:@"article"];
      [params setObject:[self getHomePageTitle] forKey:@"title"];
      [params setObject:@"xxxxxxxxxxx" forKey:@"app_id"];        
      [params setObject:self.regularUrlForFacebookSharing forKey:@"url"];
      [params setValue:appDelegate.facebook.accessToken forKey:@"access_token"];
  
      [appDelegate.facebook requestWithGraphPath:@"me/news.reads" 
                           andParams:params
                       andHttpMethod:@"POST"
                         andDelegate:appDelegate.facebook];
  </code></pre>
  
  <p>And everything I set for "article" I keep getting the error following error</p>
  
  <blockquote>
    <p>{"error":{"message":"(#3503) \"\u003Ctitle xmlns=\"http://www.w3.org/1999/xhtml\">xxxxx is an invalid value for property \"article\" with type \"Reference\"","type":"OAuthException","code":3503}}</p>
  </blockquote>
  
  <p>Please advice how should I set a "reference" property type</p>