So it turns out my site's previews have been borked for who knows how long due to me not understanding that #OpenGraph 's `og:url` is meant to be a unique ID, not just something you can set to your site's base URL and be done with it.
Because of that articles have had completely unrelated previews and that's not very potential-reader friendly.
Annoying to learn, but better late than never...





Like this:

