Anthony Eden

When Facebook crawls your site, it uses the Canonical URL and links directly to this in all Facebook posts. This plugin prevents 
Facebook from seeing the Custom Canonical URL entered into the Yoast SEO plugin. This means it will always 
link to your own website, even if you’ve set the Canonical URL to another site.

Remove Yoast Canonical URL for Social

This plugin removes manually entered Yoast SEO Canonical URLs when social media networks such as Facebook crawl any page on your website.

Harsh Agrawal

Content syndication is a process of amplifying your content to other blogs without hurting the SEO of your original content. You can let other blogs to republish your content in exact format with rel=canonical tag.
You can read about Rel=canonical tag here at pt.4: https://support.google.com/webmasters/answer/139066?hl=en
In this guide you can learn everything about using content syndication for content marketing: http://www.shoutmeloud.com/relcanonical-wordpresss-content-syndication-seo.html
Canonical SEO Content syndication plugin adds a meta box at post editor section. You can add permalink of post where the content was originally published. Popular blogs like bufferblog, readwriteweb are taking advantage of content syndication and rel=canonical tags.

Canonical SEO Content Syndication WordPress Plugin

Canonical SEO Content syndication plugin adds rel=canonical tag for content syndication. The meta box is added at edit post section.

Remove Yoast Canonical URL for Social vs Canonical SEO Content Syndication WordPress Plugin