We have front matter for images used in link preview(twitter, facebook, etc…)
If the meta_image front-matter is not set, image front-matter will be used instead(as a default value).

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---
title:
date:
...
meta_image: images/posts/myMetaImage.png
---

The meta_image path is relative to the static folder. In the above example, image should be in the root/static/images/posts folder.