title: Facebook graph API returns only name and id for some websites
body: <p>I've developed a WordPress plugin for social login using Facebook. 
  I'm using the Facebook graph API <code>/me</code> to retrieve the user details. My problem is that for some websites, when installed a Facebook login plugin, I'm only getting user ID and name. </p>
  
  <pre><code>Array
  (
      [name] =&gt; John doe
      [id] =&gt; 398463877009801
  )
  </code></pre>
  
  <p>but same code is working well for some websites as well. </p>
  
  <pre><code>Array
  (
      [id] =&gt; 398463877009801
      [email] =&gt; something@gmail.com
      [first_name] =&gt; John
      [gender] =&gt; male
      [last_name] =&gt; Doe
      [link] =&gt; https://www.facebook.com/app_scoped_user_id/398463877009801/
      [locale] =&gt; en_US
      [name] =&gt; John Doe
      [timezone] =&gt; 5.45
      [updated_time] =&gt; 2015-05-03T11:24:16+0000
      [verified] =&gt; 1
  )
  </code></pre>
  
  <p>What might be the possibilities of the errors for the site that is getting only name and id?</p>