Facebook and X (Twitter) are both text-first platforms, but their specs could not be more different. Facebook lets you write up to 63,206 characters per post — effectively unlimited for most purposes — while X cuts standard accounts to 280. That is not a formatting nuance; it is a fundamental rewrite. A long-form Facebook update, announcement, or story has to be distilled to a single hook before it can live on X, and anything that doesn't fit that constraint gets truncated or simply left on the cutting-room floor.
The other major collision is link behavior. A Facebook post URL pasted into an X post expands to almost nothing useful, so the idea has to be restated natively on X rather than cross-referenced. This guide maps the exact spec deltas, the handful of things that transfer cleanly, and the step-by-step workflow — by hand, or composed once in SocialKit with per-network customization on one screen.
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Everything that changes between the two composers, side by side.
| Spec | Facebook (from) | X (Twitter) (to) |
|---|---|---|
| Primary canvas | 1080 × 1350 px · 4:5 (post) | 1600 × 900 px · 16:9 (post image) |
| Caption limit | 63,206 characters (feed truncates after a few lines with “See more”) | 280 characters (X Premium subscribers can post up to 25,000) |
| Video length | Long feed uploads supported (hours); Facebook Reels are far shorter — check the composer for your account’s cap | About 2 minutes 20 seconds for standard accounts; longer uploads are a Premium feature |
| Hashtags | Supported but lightly used — one or two at most reads native on Facebook | Count toward the character limit; one or two is the platform norm |
| Link in post | Facebook links can sit anywhere in the post body; a link preview card auto-generates | X links count toward the 280-character limit and are shortened to a t.co URL |
| Aspect reframe | Facebook feed accepts portrait, square, and landscape images in the post composer | X displays images in a 16:9 crop in the timeline — a tall portrait image may need reframing to show the subject clearly |
The good news
The fine print
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Tip 1
Write the X post first, then expand for Facebook — forcing yourself to hook in 280 characters before writing the longer version often produces a stronger Facebook opening line too.
Tip 2
If your Facebook post has multiple ideas, consider a thread on X: one tweet per idea, each self-contained, gives the full content a longer shelf life than a single truncated post.
Tip 3
Never link to the Facebook post itself: X viewers who aren't logged into Facebook may hit a login wall, which kills the CTA entirely — always link to the underlying resource (article, video, product page) directly.
FAQ
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You can schedule every Facebook post to also publish to X, but the results are almost always poor for posts over a few sentences — an auto-truncated 63,206-character post that gets cut at 280 looks broken and reads as recycled content. A workflow that sends short Facebook posts automatically and routes longer ones through a manual X rewrite step gives far better engagement on both platforms.
X standard accounts cap video at about 2 minutes 20 seconds. A long Facebook feed video will be rejected at upload or truncated, depending on how you post it. You need to extract a short teaser clip from your original source file and attach that to the X post, optionally with a link to the full video wherever it lives.
Generally not in a useful way. A facebook.com post URL shared on X does not produce a rich preview for many viewers and may require the viewer to be logged into Facebook to see anything at all. Always link to the underlying content — your website, article, or video host — rather than to the Facebook post itself.
Both platforms support hashtags but use them lightly — one or two at most reads native on Facebook, and the same norm holds on X. The key difference is budget: on X, hashtags eat into your 280-character limit for standard accounts, so each tag has a real cost. Pick the single best-fit tag for X's community and leave the rest out.
Compose once, customize the caption per network, and let SocialKit publish to Facebook, X (Twitter), and 9 more platforms on schedule — no re-uploading, no copy-paste.
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