title: UIActivityViewController when have no Facebook account in settings
body: <p>I'm using UIActivityViewController, I want to show Facebook option even if the user has not defined a Facebook account in device settings.</p>
  
  <p>In my code, Facebook option not shown when there is no Facebook acoount in settings.</p>
  
  <pre><code>UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:itemsToShare applicationActivities:nil];
  [self presentViewController:activityVC animated:YES completion:nil];
  </code></pre>
  
  <p>But, in Safari or more apps there is Facebook option and when click on it - a alert is displayed with "No facebbok account" title and message says "go to settings".</p>
  
  <p>There is any way to add Facebook like this or this possible just for apple apps?</p>
  
  <p><img src="https://i.stack.imgur.com/6Ccfl.png" alt="No Facebook Account"></p>