Adding a facebook “like” button to your WordPress post is a snap. Just add this code in your single.php template.
<iframe src="https://www.facebook.com/plugins/like.php?href=<?php echo rawurlencode(get_permalink()); ?>&layout=standard&show-faces=true&width=450&action=like&font=arial&colorscheme=light" scrolling="no" frameborder="0" allowTransparency="true" id="facebook-like"></iframe>
