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Yoast SEO - a highly recommended plugin for WordPress - has the ability to add tags for Facebook posting of your links (social tab).
The downside is that it pulls in all images of your post, not just the featured image.
If you're like me, and you're WordPress setup uses featured images for posts, then the following code, added to functions.php, will limit the selection to just the featured image:
function mysite_opengraph_content($val) {
return preg_replace("/<img[^>]+>/i", "", $val);
}
add_filter('wpseo_pre_analysis_post_content', 'mysite_opengraph_content');
Tip: For testing your webpage concerning the Facebook tags, try this debug link: