How to check if user shared website (Facebook)? Is it possible?

Question

I am currently writing a website and I need some help about facebook integration. I need a function (PHP or JS, both will help) that can check if a given user shared my website, and I couldn’t find out how to write one. Could you please point me at the right direction?

Answer 1

First you have to load the Facebook SDK right after your tag:

<div id="fb-root"></div>
  <script>
  window.fbAsyncInit = function() {
    FB.init({
      appId                : "YOUR APP ID",
      status               : true, // check login status
      cookie               : true, // enable cookies to allow the server to access the session
      xfbml                : false,  // parse XFBML
      perms                : 'read_stream',
      access_token         : "USER ACCESS TOkEN",
      frictionlessRequests : true
    });
  };

  // Load the SDK Asynchronously
  (function(d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s); js.id = id;
    js.src = "//connect.facebook.net/pt_BR/all.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

</script>

Then you can use the callback function to do what you want:

<script type="text/javascript">
    function shareOnFacebook() {
    FB.ui(
      {
        method        : 'feed',
        display       : 'iframe',
        name          : 'name',
        link          : 'http://www.linktoshare.com',
        picture       : 'http://www.linktoshare.com/images/imagethumbnail.png',
        caption       : 'txt caption',
        description   : 'txt description',
        access_token  : 'user access token'
      },
      function(response) {
        if (response && response.post_id) {

          // HERE YOU CAN DO WHAT YOU NEED
          alert('OK! User has published on Facebook.');

        } else {
          //alert('Post was not published.');
        }
      }
    );
  }
</script>

Then you should use it like this:

<a href="#" onclick="shareOnFacebook();">Share on facebook</a>