How to add Facebook COMMENT Box to a Website or Blog
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Most of the web or blogs service providers won't offer a commenting system to its web pages or blogs, which is huge draw back. But you can modify the source HTML/CSS and can add the comment box. 

Adding a FaceBook comment box for Blogs or Websites requires FaceBook comment box plugin, which can be easily integrated to your website or blog page.

Here we'll explain the steps on how to add Facebook comment box to your web or blog page;

First you need to get the Facebook comment box code; so login to Facebook and then go to Facebook social plugins page. 
Link: https://developers.facebook.com/docs/plugins/comments/

You will see a form and need fill it with the required details, as below.
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FB LIKE button to Website or Blog
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FB SHARE button to Website or Blog
URL to comment on – Here you need to enter the web page or blog post URL that you want people to comment  Do note, Facebook allows you to generate the code specific to particular URL only and if you want the comment box for individual pages then you need to generate the code for each URL separately or you can later modify the web address in the web page code it self.

Width: 600 (As per your requirement)

Number of Posts: Number of posts to show in a page

Color Scheme– Here you can choose the layout. You can see the preview to understand each layout option.

Once you fill in the form, click on the "Get Code" button to generate the Facebook comment plugin code to add to your website or blogs HTML code. 

 "HTML5" tab, there will be two parts of the code, copy both the parts of the code and paste it in a Notepad or Notes.
Insert the first portion into your main HTML/CSS code, ideally somewhere inside <body> tag and then place second part of the code to embedded code element, where you want to show the comment box in the webpage or blog.
Once you click out of the Embedded code element your FB comment box will appear and the same will be available to all of your visitors once you publish the page.