open-graph-tags.php

<meta property="og:title" content="<?php echo the_title(); ?>"/>

<meta property="og:description" content="<?php echo $excerpt; ?>"/>

<meta property="og:type" content="article"/>

<meta property="og:url" content="<?php echo the_permalink(); ?>"/>

<meta property="og:site_name" content="<?php echo get_bloginfo(); ?>"/>

<meta property="og:image" content="<?php echo $img_src; ?>"/>