I remember YouTube launching 6‑second bumper ads in 2016, pitched for mobile attention and higher completion rates. Did any platform run true 6s units earlier, and did you see better ad recall or cheaper reach than 15s when you optimized frequency and placement mix?
But vine had 6s promoted loops before your ‘6‑second bumper ads in 2016’, but YouTube scaled them. On YouTube, we saw cheaper CPMs than 15s, but recall only moved when we sequenced 6s → skippable 15s and capped frequency at 2–3/week — run Brand Lift to confirm. Did you see anything different when you flipped the order?