title: Permission issue when publish comment with Facebook Graph API v2.12
body: <p>I am testing the facebook graph API comments
  <a href="https://developers.facebook.com/docs/graph-api/reference/v2.12/object/comments" rel="nofollow noreferrer">https://developers.facebook.com/docs/graph-api/reference/v2.12/object/comments</a></p>
  
  <ol>
  <li>I checked my permission for the access token it contains the permission, which required by API. see the screenshot</li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/CEJtU.png" alt="enter image description here"></p>
  
  <ol start="2">
  <li>I test my object-id (1797963943566411_1975256375837166)  which is correct see me screenshot</li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/JPSNF.png" alt="enter image description here"></p>
  
  <ol start="3">
  <li>Change the request method to POST and adding post data <code>{"message": "haha"}</code>
  I get the error message shows:
  "(#3) Publishing comments through the API is only available for page access tokens" see my screenshot</li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/owrik.png" alt="enter image description here"></p>
  
  <p>As you can see the first step checking, I have all the permission that the 
  API required. </p>
  
  <p>Can any one see any sort of error in this process? </p>