Open Graph

Open Graph is a set of meta tags, originally from Facebook, that describe how a page should appear when its link is shared on social platforms. By setting properties such as og:title, og:description, og:image, and og:url in the page head, you control the title, summary, and preview image of the card that platforms generate, rather than leaving them to guess. Many platforms read Open Graph tags as a fallback even when they have their own formats, which makes them broadly useful. After changing them, it is worth re-scraping the URL in a platform’s debugging tool, since previews are often cached from the first time a link was shared.