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W3C Validation - Page not validating with OG: / Facbook tags
<?php if($_SERVER['HTTP_USER_AGENT']=='facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)')
{
echo '  <meta property="og:image" content="IMAGE URL" />
 <meta property="fb:app_id" content="YOUR FB ID" />
 <meta property="og:site_name" content="SITE NAME" />
<meta property="og:description" content="description" /> ';
 break;
}