title: UIActivityViewController not showing Built-in activities
body: <p>I'm using a UIActivityViewController with just some of the Apple built-in services.  As a test, I specify no excludedActivityTypes (the docs say this is nil by default) and no completion handler (I just want the services to do their thing).</p>
  
  <p>I'm building using Xcode/SDK Version 5.1.1 (5B1008)</p>
  
  <pre><code>// this is the handler that catches the Action button tap
  // self.noteArea.text is the UITextView.text string to use by the services.
  - (IBAction)actionTapped:(UIBarButtonItem *)sender
  {
      NSString *s = [NSString stringWithString:self.noteArea.text];
      NSArray *a = [NSArray arrayWithObject:s];
      UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:a applicationActivities:nil];
      [self.navigationController presentViewController:activityController animated:YES completion:NULL];
  }
  </code></pre>
  
  <p>On both the simulator and a real iPhone the activity popup shows only Mail and Copy -- nothing else.  Why just those two?  Mail and Copy work fine, so everything that does show seems to work properly.  How do I get the other functions to display?</p>