Put this in your head
<?php $fb_image = wp_get_attachment_image_src(get_post_thumbnail_id( get_the_ID() ), 'thumnail'); ?>
<?php if ($fb_image) : ?>
<meta property="og:image" content="<?php echo $fb_image[0]; ?>" />
<?php endif; ?>
To test it out, you don’t have to create a new post, just paste your URL in here: https://developers.facebook.com/tools/debug Here you can the data and possibly some errors.
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