og:image as featured image

Noticed ur plugin puts an og:image randomly
can you add an option to put the facebook image when sharing as the FEATURED image?

if ($picture = $this->get_first_image_for($post->ID)) {
$og[‘og:image’] = $picture;
}

or how can I mod that to set it as the featured image?

https://www.ads-software.com/plugins/fatpanda-facebook-comments/