Font-awsome icons if post has feed tag and "social media" tag

tw-wp-post-tags.php

<footer>
<?php
if (get_the_tags()) $posttags = get_the_tags();
	if ($posttags) {
		$tagging = '';
		foreach($posttags as $tag) {
			if ($tag->slug != 'feed') {
				$tagging = $tagging . '<i class="fa fa-'.$tag->slug.'-square"></i>';
			}
		}
	}
?>
<?php echo $tagging; ?>
</footer>