This plugin adds a Facebook “Like” Button to your blog posts with admin options to change the location of Facebook Like button, font, show faces, use the box with count as well as other cool and useful options. Visitors “liking” your content automatically posts them as shared item on their Facebook profile with a thumbnail of your site’s image post.
The Like button lets a user share your content with friends on Facebook. When the user clicks the Like button on your site, a story appears in the user’s friends’ News Feed with a link back to your website.
Plugin homepage: http://allanjosephbatac.com/Wordpress-Facebook-Like-Plugin/