Why is there no og:image and twitter:image tags?

[kvanlombeek]

These image tags are important to display the website attractively when somebody shares the site on Twitter or Facebook or Whatsapp.

[ashmaroli]

The plugin does render these tags:

jekyll-seo-tag/lib/template.html

Lines 32 to 40 in 38ef0be

	{% if seo_tag.image %}
	<meta property="og:image" content="{{ seo_tag.image.path }}" />
	{% if seo_tag.image.height %}
	<meta property="og:image:height" content="{{ seo_tag.image.height }}" />
	{% endif %}
	{% if seo_tag.image.width %}
	<meta property="og:image:width" content="{{ seo_tag.image.width }}" />
	{% endif %}
	{% endif %}

jekyll-seo-tag/lib/template.html

Lines 55 to 60 in 38ef0be

	{% if seo_tag.image %}
	<meta name="twitter:card" content="{{ page.twitter.card | default: site.twitter.card | default: "summary_large_image" }}" />
	<meta property="twitter:image" content="{{ seo_tag.image.path }}" />
	{% else %}
	<meta name="twitter:card" content="summary" />
	{% endif %}

Perhaps you'd like to take a look at the documentation:
https://github.com/jekyll/jekyll-seo-tag/blob/master/docs/usage.md