Ayesh Karunaratne

Adds support for embedding Facebook and Instagram posts in Block Editor (Gutenberg) and Classic Editor. This feature was removed in WordPress core due to deprecation of legacy APIs WordPress core used.
Prior to WordPress 5.5.1, WordPress had support to embed Instagram and Facebook photos, videos, notes, quizes, etc in posts created with Block Editor and Classic Editor. However, Facebook removed this legacy API in October 2020, and this plugin implements the new APIs to bring back support for Facebook and Instagram content embedding.
Note that you will need to register a Facebook developer account and create an app to get API credentials that this plugin uses. There is no coding necessary, but an API key needs to be created and set for the plugin.
Detailed setup instructions are available in <a href="https://php.watch/articles/wordpress-facebook-instagram-oembed" rel="nofollow ugc">oEmbed Plus guide at PHP.Watch</a>
This project is not owned, endorsed, or otherwise affiliated with Facebook Inc. or Instagram LLC.

oEmbed Plus

As the title suggests, this is written beautifully and works perfectly.

No bloat.

On-screen links to where you need to go at facebook and documentation.

And the ability to define keys in wp-config make it great for multisite.

Works perfectly, and elegantly coded for MultiSite

Adds support for embedding Facebook and Instagram posts in Block Editor (Gutenberg) and Classic Editor.

Palasthotel GmbH

greatestview

ATTENTION for WP Version 5+: This plugin does not work with Gutenberg (no problems with Classic Editor plugin though)! Gutenberg brings its own HTML structure for oEmbed elements, which is quite difficult to target.
This plugin checks, if the first line of the content is a valid oEmbed URL. If that is the case, it replaces the thumbnail image with the oEmbed element (e. g. with a YouTube video). Now you don’t have to care too much about a thumbnail image, since instead you would see the video or any other oEmbed content. You can even e. g. watch videos on your blogs front page without opening the post.
Works for all WordPress contents, which have a thumbnail set and are not password protected.
The active WordPress Theme must use the_post_thumbnail() or get_the_post_thumbnail() functions for this to work!

Replace Thumbnail with oEmbed

Replaces the thumbnail image with the oEmbed element from the first line of the content.

oEmbed Plus vs Replace Thumbnail with oEmbed