What it is
A "Twitter Card" (the platform's own name for the feature, predating its rename to X) is the rich preview shown when a link is shared on X — typically including an image, title, and description, rather than a plain, unadorned text link. It's controlled by a specific meta tag, most simply <meta name="twitter:card" content="summary_large_image">, which tells X to build this larger, image-forward preview format specifically.
X does fall back to reading standard Open Graph tags (og:title, og:description, og:image) for the actual content of the preview in many cases — but without this specific twitter:card tag present, it may not build a rich preview at all, defaulting to a bare link instead.
Why it matters
Links shared on X without a working card show up as plain, unremarkable text in a feed full of other posts competing for attention — easy to scroll straight past. A working card with an image and headline is considerably more eye-catching and gives people shared with a real, immediate sense of what they'd be clicking through to, before they've read a single word of surrounding commentary.
This is a very small, one-line addition on top of Open Graph tags you may have already set for Facebook and LinkedIn — there's essentially no reason to skip it once those are already in place.
How to fix it
- Confirm you already have Open Graph tags (og:title, og:description, og:image) set on the page, since X reads much of the preview content from those.
- Add
<meta name="twitter:card" content="summary_large_image">to the page's<head>section, which requests the larger, image-forward preview style. - If you're using a website builder or SEO plugin, this is frequently included automatically alongside your other social sharing settings — check there before adding it manually.
- Test the result with X's Card Validator tool (or by sharing the link in a private draft post) to confirm the preview displays as expected.
- Re-run your Launch Readiness check to confirm the tag is now detected.