The FBLikeButton Plugin for WordPress by Vas Pro allows you to configure and display the FaceBook Like Button before and/or after each post and/or page, and whether or not you want the button to appear on your homepage.
Plugin homepage: http://wp-plugins-themes.com/wp-plugin/fb-like-button-plugin-with-user-face/
Download: http://wordpress.org/extend/plugins/fb-like-button-plugin-with-user-face/