On my website I'm trying to get the facebook share thumbnail image to show when I try and share on facebook. In the page settings->advanced settings page scripts box I've added <link rel="image_src" type="image/png" href="
" />. The page I'm trying to do it with is http://www.boomplug.co.uk/documents/products.html. I've tried different images and i've checked that the location is valid also.Thank you very much.