jarv.is/layouts/shortcodes/facebook.html

{{- $url := printf "https://www.facebook.com/plugins/post/oembed.json/?omitscript=1&url=%s" (.Get "url" | urlize) -}}
{{- $json := getJSON $url -}}

<div class="embed facebook">
{{ $json.html | safeHTML }}
</div>

{{- define "__shortcode_facebook_js" }}
<div id="fb-root"></div>
<script async defer src="https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v5.0"></script>
{{- end }}