Open your single.php (or any file where you’d like the “Like” button to be displayed), and paste the following code:
<iframe src="http://www.facebook.com/plugins/like.php?href=<?php echo urlencode(get_permalink($post->ID)); ?>&layout=standard&show_faces=false&width=450&action=like&colorscheme=light" scrolling="no" frameborder="0" allowTransparency="true" style="border:none; overflow:hidden; width:450px; height:25px"></iframe>
That’s all. Once the file saved, the facebook “Like” button will be displayed. A live demo can be seen on Visiter New York.
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Add a Facebook “Like” button to your WordPress blog