2 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
The twitter:card meta tag of a page: whether it is present and its content (name= or property= form), plus length and a note when the value looks wrong (empty, too long, or a placeholder). One tag, one answer, for SEO an...
Open Graph and Twitter Card extractor: og:title, og:description, og:image (with resolved URL), og:type, og:site_name, og:url, og:locale, article dates, plus twitter:card/site/creator/image. Exactly what a share preview w...