Open Graph is a protocol which enables rich previews on social media. It is heavily used on the web and different messenger apps. See https://ogp.me
MycorrhizaWiki supports it and outputs the needed meta tags to enable previews.
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The name is hypha's name.
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The image is the first image hypha embeds. If the hypha is an image, that image is shown. If there is no image, favicon is shown instead.
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The description is hypha's first paragraph.