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.

wistia

Wistia’s embed codes are designed to be very durable, but WordPress has a 
history of being particularly troublesome. This plugin adds oEmbed support so 
that pasting a link to the video’s page in Wistia will embed the video. The 
video’s URL must be by itself on its own line for this to work.
As of version 0.6 of this plugin, it is recommended that you check 
“Use oEmbed?” under Advanced Options when generating your embed code.
As of version 0.8 of this plugin, the legacy “Anti-Mangler” feature is an 
option that is turned off by default.
See the Wistia documentation for more: 
http://wistia.com/doc/wordpress#using_the_oembed_embed_code
<h3>Automatic Installation</h3>
<ol>
<li>In Admin Dashboard, go to Plugins > Add New.</li>
<li>Search for “Wistia WordPress Plugin”.</li>
<li>Find the plugin and click “Install”.</li>
</ol>
<h3>Manual Installation</h3>
<ol>
<li>Make a ‘wistia-wordpress-oembed-plugin’ directory in ‘/wp-content/plugins/’.</li>
<li>Upload all files in the repository to the 
‘/wp-content/plugins/wistia-wordpress-oembed-plugin/’ directory.</li>
<li>Activate the plugin through the ‘Plugins’ menu in WordPress.</li>
</ol>

Wistia WordPress Plugin

Enables all Wistia embed types to be used in your WordPress blog.

oEmbed Plus vs Wistia WordPress Plugin