The Receipts
Every stat here carries two or more independent sources. Sources span platform documentation, peer-reviewed studies, and industry benchmarks. Anything labelled directional is benchmark-grade, not study-grade — the label stays visible on purpose.
Table A: The Format Ladder
| Channel | Provoke | Persuade | Position | Sources |
|---|---|---|---|---|
| TikTok | Under 10 sec | 10–38 sec | — | |
| YouTube Shorts | Under 15 sec | 20–45 sec | — | |
| Instagram Reels | 7–15 secDirectional | 15–60 secDirectional | — | |
| X / Twitter | The post | 15–45 sec | — | |
| LinkedIn video | First line before "see more" | 30 sec–3 min | 10 min mobile / 15 min desktop | |
| YouTube long-form | Title, 5–8 words | — | 8–15 min, or 40–60 min for watch time | |
| Substack | Subject line | 100–200 words (45–90 sec) | 700–1,500 words (5–11 min) | |
| Email newsletter | Subject line | 50–125 words (25–55 sec) | 200–400 words (90 sec–3 min) | |
| Blog / SEO | H1, 5–8 words | Summary block | 1,500–4,000 words (11–30 min) | |
| Podcast | Episode title | Cold open | 25–40 min standard; 50–60 min for major guests; 80+ min where narrative earns itDirectional |
Completion beats duration on every platform. A 45-second video finished by 80% beats a 3-minute video finished by 20%; videos above 50% average completion get significantly more TikTok distribution regardless of length; a 45-second video at 70% completion outperforms a 15-second video at 40%.
Position is deliberately blank for short-form — no sub-60-second format can carry history, arc and future. News editorial is excluded: typical news length fell from ~449 to ~380 words over six months while the most-shared NYT stories average over 2,000, so no defensible single range exists. Instagram Reels and podcast bands are directional. Word-to-time equivalents use the site's own ratio: two hundred words ≈ ninety seconds.
Table B: Packaging the Provocation
| Channel | Asset | Spec | Sources |
|---|---|---|---|
| YouTube long-form | Thumbnail | 1280x720, 16:9, under 2MB; 0–3 words, under 12 characters; one dominant subject, 2–3 colours; 30–40% negative space; legible at 120–160px; contrast 4.5:1 | |
| YouTube Shorts | Vertical cover | 9:16; text inside safe zone clear of UI overlays | |
| TikTok / Reels | Cover frame | Selected frame + on-screen hook text; first 3 seconds decide the rest | |
| Podcast | Cover art | Square 1:1; 1400x1400 min, 3000x3000 recommended; 72dpi RGB; 2–3 words max; one focal point; legible at 55px; max two fonts; never the word "Podcast" | |
| Preview text | 40–90 characters, key message in first 40; mobile shows 30–55 | ||
| Blog / Substack / X / LinkedIn | OG / share card | Featured image doubles as social card; check crop before publishing |
Image and words must not repeat each other — the image raises the question, the words sharpen it. Strong sentiment beats neutral: a 2024 Journal of Business Research study of 16,215 YouTube covers found positive or negative sentiment drives more views while neutral underperforms. Expressive faces outperform object-only by 25–30% (directional). YouTube CTR averages 3–4%, with 5–7% strong. Email preview text is cited by 24% of recipients in the open decision. Misleading packaging wins the click and destroys retention.
A 2023 peer-reviewed study questions whether CTR or watch time better predicts high view counts, so packaging should not be treated as outranking everything else.