AdEspresso has created the best Wordpress plugin for users looking to use pixel tracking on their Wordpress website! You can download the plugin from here! You can finally include conversion tracking on your website, create custom audiences and events and make your Facebook campaigns even more relevant.
If you have questions on how the Pixel Caffeine plugin works, they can be directed to the Wordpress community: Support Community on Wordpress.
You can find some a dedicated FAQ for the Pixel Caffeine tool available here!