title: How to tell if someone came to my website from facebook using mobile app
body: <p>I have the following php code on my server that allows me to tell if user cam to my webpage from facebook:</p>
  
  <pre><code>if ($_SERVER[HTTP_REFERER] == "https://www.facebook.com/") {  do stuff }
  </code></pre>
  
  <p>So, the problem here is that people are also using facebook on mobile using facebook app, so I don't get the referral link this way. </p>
  
  <p>Is there any way I can tell if someone came to my webpage clicking on a link using facebook app? </p>