Passing scrap = true to facebook API

Due to the nature of my page I need to re-scrap it every time the page is hit, I have found this thread Re scrap URL

My current javascript is as follows

 <script>

    (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/en_GB/sdk.js#xfbml=1&version=v2.0";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));

    $.post('http://ift.tt/wljqS4', { // This line does nothing for me what so ever
        id: 'http://ift.tt/1FqcwLU',
        scrape: true
    },
    function (response) {
       console.log(response);
    }
);
</script>

But when I run the $.post method nothing happens it still remembers the previous image.

I've only been trying to use this facebook for a day or two now so please bare with me.