For Facebook Comments

Facebook comments has been introduced to Blogger template in mid January 2017 along with DISQUS & Google+ comments, replacing Blogger default comment system, which has been disabled to allow AMP HTML integrations.

Reference here includes Fb comments plugin setup, how to register a new Fb App ID & sync posting between blog & Facebook posts automatically.

Locator

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Template HTML

var FB_APP_ID = 123456789012345;

• Facebook App ID required to sync with your comments dashboard.
• Replace integers with the unique fb_app_id value provided by Facebook Developer page.

Template HTML - Blog1

<b:includable id='post-comments-fb'>

• Theme widget tags to render Facebook comments & containers.

Element Tags

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Facebook Comments Container

<div class="fb-comments" data-numposts="10" data-order-by="social" data-width="600" expr:data-href="data:blog.canonicalUrl"> </div> 

• Replace data-numposts value for the default amount of comments to display
• Replace data-order-by value with social, newest or oldest.
• Replace data-width value to set the default comment container width by default. On smaller screen sizes, responsive styles has been automatically included.

Behavior

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• Facebook comments is available on web view to allow quicker display in mobile devices.
• Located inside an amp-accordian & optionally could display upon page render.
• Comment container font & link color inherits Facebook plugins pre-set styles.
• Comments sync automatically (if shared) between posts at Facebook pages & blog posts.
• Comments moderation can be viewed on blog page or redirected to Facebook App comments dashboard.

Important Notes

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• By default, Facebook comments & its containers is commented out in blog widget.
• Uncomment Facebook comment widget tag to use. 
• Blog page canonical URL's is used for sharing to Facebook pages/posts. 
• Canonical URL's shared at Facebook pages will automatically sync comments by Facebook on both pages/posts.

Useful Reference

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Create a Facebook App ID

1. Detail instructions to create a Facebook App ID is available here at Facebook for Developers page: https://developers.facebook.com/docs/apps/register

About Facebook Comments Plugin

1. Fb Comments Plugin lets users comment on content on your site using their Facebook account. Users can choose to share their comment activity with their friends (and friends of their friends) on Facebook as well. The comments plugin also includes built-in moderation tools and social relevance ranking. More information: https://developers.facebook.com/docs/plugins/comments/