This plugin will help you to display Facebook Comments on your website. You can use Facebook Comments box on your posts/pages
Add, customize and moderate Facebook Comments on your website in simple and easy way. Decide where and how Facebook comments will appear.
Facebook Like Lock for WordPress. Locks your content and user can unlock by clicking on like button.
Like Gate allows you to reveal some hidden/secret content when the user likes the article. Therefore increasing the likeness of your articles.