It is there to authenticate you with the social media networks as well as create open graph tags
it is a form of structured data called open graph
See
- https://builtvisible.com/a-look-at-social-mark-up/
- http://kb.yoast.com/article/219-getting-open-graph-for-your-articles
- https://yoast.com/social-media-optimization-with-wordpress-seo-by-yoast/
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I hope this helps, Tom