This plugin allows user to embed Facebook conversion pixel script to wordpress website. You can also add pixel code to particular page/post.

Insert the New Facebook Pixel to ALL your pages with one plugin

The Marketers Toolbox will easily let you add Facebook or Google AdWords conversion tracking scripts to any page, post or custom type of content.

Very Simple plugin to add any type of tracking code on your website in a second and also block the direct access to thank page.