title: Get Facebook video thumbnail image URLs?
body: <p>We can get the video thumb of YouTube videos by using the video ID in an URL the way defined below                                                           </p>
  
  <pre><code>$src = "http://img.youtube.com/vi/".$video_id."/default.jpg";               
  </code></pre>
  
  <p>Similarly, how can I get the video thumb of Facebook videos? Is there any predefined URL in which we put the Facebook video ID and get the as like youtube defined in the way above?</p>