No documentation on this in your theme docs.

So can you shed some light on just whos APPID this is, and what we need to do to change it.

<div id="fb-root"></div>
<script type="text/javascript">
  window.fbAsyncInit = function() {
    FB.init({
      appId: '0c18007de6f00f7ecda8c040fb76cd90',
      status: true,
      cookie: true,
      xfbml: true
    });
  };
  (function() {
    var e = document.createElement('script'); e.async = true;
    e.src = document.location.protocol +
    '//connect.facebook.net/en_US/all.js';
    document.getElementById('fb-root').appendChild(e);
  }());
</script>

The appid looks remarkably like APPSECRET and not an APPID ?

Plus whos is it, should we create our own etc.