Checks whether the page has a title and meta description.
Expected: a non-empty title tag and a description such as "Practical guides for creating emoji."
Checks the core Open Graph tags for social previews.
Expected: og:title, og:description, and an og:image URL, such as https://example.com/preview.jpg.
Checks whether a Twitter Card is defined.
Expected: twitter:card="summary_large_image" or another supported card type.
This is a focused diagnostic, not a full AdSense audit or a Google approval prediction.
