Now, it is easier than ever to add the Facebook famous “Like”/”Recommend” button to your posts and increase their popularity.
First, you need to login as administrator to the WordPress admin panel. Then go to Appearance -> Editor. Then place the following code wherever you want the like button to appear :
<iframe src="http://www.facebook.com/plugins/like.php?href=<?php echo urlencode(get_permalink($post->ID)); ?>&layout=standard&show_faces=false&width=375&action=like&colorscheme=light" scrolling="no" frameborder="0" allowTransparency="true" style="border:none; overflow:hidden; width:375px; height:25px"></iframe>
The final result should look like this :

Others social plugins of Facebook, please refer to https://developers.facebook.com/docs/plugins/
About (me) Okta Sihotang
Just an ordinary programmer and founder of www.oktaweb.net for application/website/blog development, IT Consultant, and Web master at Jakarta Indonesia.
Contact (me) Okta Sihotang
If you want to contact me for some stuffs like advertise, review product, web development. Please feel free to email me oktasihotang[at]gmail[dot]com
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I agree with your How to Add a Facebook Like Button to Your WordPress Posts | Okta Sihotang is a Web Developer, IT Consultant and WordPress Geeks, wonderful post.