Facebook Comments can be added by adding a Social Widget
1. Click on the page to edit
2. Click on Add New
3. Click on the Social Widget
4. Drag the type of Social Media form you want (e.g. FB comments)
5. Click on Advanced from the sidebar
6. Input your Facebook App ID and Comments URL
7. Save and Publish
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How to get Facebook App ID
Follow these steps https://developers.facebook.com/docs/apps/register
Check this video https://www.youtube.com/watch?v=HIf0JW7JhcE
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