Can you post the same content on all platforms?
The idea ports across platforms; the exact file usually should not.
You can post the same content across platforms, but adapt it rather than dumping the identical file. Reels, TikTok and Shorts each suppress clips carrying another app's watermark, so re-export clean and fit each platform's format and length. The structure — the hook, the payoff — travels everywhere; the raw file often gets down-ranked when it obviously came from elsewhere. Rebuild the same idea natively for each platform.
Posteriks finds posts that beat their own account baseline in your niche and helps you build your own version — not a copy. Check your own post free →
Treat cross-posting as repurposing: same mechanic, native asset per platform. That keeps reach up where reposting the exact watermarked file would drag it down.
The next step is always the same: find what already beats the baseline in your niche and rebuild it. See viral posts by topic or test a post in the Baseline Beat Checker. More in Answers.
FAQ
Will I get penalised for cross-posting?
Not for the idea, but watermarked or obvious re-uploads get suppressed. Re-export clean and native for each platform to avoid it.