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Add WordPress Featured Image as Automatic Facebook Like Button Image

Add the following in header.php, within the html head tag.

<?php if (has_post_thumbnail() && is_single()) { // if feat im exists && current page is single article
$thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'medium' );
$thumb_url = $thumb['0'];
?>
<meta property="og:image" content="<?php echo $thumb_url; ?>" />