How to update facebook open graph image

Question

Say if you have set the facebook image for your webpage via the meta tag of the open graph protocol like this: <meta property="og:image" content="http://ia.media-imdb.com/rock.jpg"/>

If you want to replace/update the image with another image of the same name rock.jpg, how do you get facebook to update your image accordingly with the new image when you share the page? Forcing facebook to fetch your page's data with this link http://developers.facebook.com/tools/debug won't update the image.

Answer 1

this is the most consistent answer I've found to this problem: https://stackoverflow.com/a/21468084/339698

If you're too lazy to go to that link, you can POST an ajax request with the url you are trying to clear:

$.post(
    'https://graph.facebook.com',
    {
        id: 'http://www.site.com/my/share/url/',
        scrape: true
    },
    function(response){
        console.log(response);
    }
);