Following a great discussion over our Slack channel (thanks Daniel!), we've just improved our SEO field. This is how it looks now:
As you can see, you can now instantly preview how your record will show up on Google, Twitter and Facebook.
The preview is generated based on the values present in the record's SEO meta tags field together with the global SEO settings of your project. Even if the SEO field is not configured, we try to guess reasonable values by inspecting the value of the other record's field.
On your frontend, you can the pull the correct meta tags from our GraphQL CDA with the _seoMetaTags helper method. A similar method exists in all our SSG plugins.