Open Graph

Open Graph meta tags are the html markup that tells Facebook, LinkedIn, X, and most other platforms what to show when a link is shared — the headline, description, and image in a preview card. Posts under this tag explain exactly which tags matter, why a wrong or missing tag causes auto-posted links to show the wrong image, and how to force a platform to refresh its cached preview after a fix. It's essential reading for anyone whose automated posts link back to their own site, since the preview card comes entirely from the destination page's markup rather than from the RSS feed itself. The practical checklist is short: og:title, og:description and an og:image large enough not to be rejected, on every page you publish. Caching is the part that surprises people, since a platform will keep showing the old preview until it is told to look again.