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What it checks

If media is empty or absent, text.trim().length > 0. Facebook supports text-only Page posts but not empty ones.

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Failure response

{
  "error": {
    "code": "preflight_failed",
    "rule": "facebook.text.required",
    "platform": "facebook",
    "message": "Facebook posts without media require non-empty text."
  }
}

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Remediation

Provide non-whitespace text or attach media.