Why tier lists print engagement on Instagram
A tier list is an opinion rendered as a small grid, and opinions travel. When a viewer sees that you put pineapple on pizza in D tier they do not agree or disagree silently - they reach for the screenshot button, bump pineapple up a row, and repost their version back to you. The reshare is the entire point of the format. A single Story bingo card that gets ten reshares beats a caption-only post that gets two hundred likes. Tier lists are the same mechanic - controversy is a feature, not a bug.
The other thing a tier list does is stop the thumb. The brain has a reflex for small grids with labels: it reads the top row first, mentally checks what you put in S, then scans down. That scan eats three seconds, which is the full lifespan of a Story slide. You do not need a caption, you do not need a hook - the shape of the content is the hook.
Picking a topic your audience will argue with
The best tier lists are about things most of your audience already has opinions on. Pizza toppings, coffee orders, reality TV villains, streaming shows, workout classes, breakfast foods, beach destinations - anyone with a phone has ranked these in their head at some point. Put your version out and they will want to correct you.
The worst tier lists are about things only you care about. "Best Marvel films" works; "Best Marvel films ranked by my 2014 viewing order" does not. "Fast food ranked" works; "Fast food ranked by the specific branch of the M6 services I grew up at" does not. Specific is good - niche to the point of being unshareable is not.
A useful rule: before you publish, ask whether three people in your group chat would disagree with at least one of your rankings. If yes, post it. If no, pick a more divisive topic.
What to do with the five tiers
The temptation is to spread items evenly across all five tiers. Do not do this - it looks like a spreadsheet. A good tier list has a shape: two or three picks in S, two or three in D, and most of the middle stuffed with B and C chips. The extremes are where the debate happens. Nobody reshares a list to move an item from B to C; they reshare to move it from D to A.
The other trick: put one universally beloved item in a low tier on purpose. "BBQ Chicken" in D tier or "Flat white" in D tier is not dishonest, it is conversation bait. Your followers will feel compelled to reshare the list with that one chip moved up, which is exactly the behaviour the format rewards.
Tier labels beyond S / A / B / C / D
S / A / B / C / D is the default because it is a gamer meme that went mainstream in the late 2010s - "S" originally came from Japanese arcade games where the top rank sat above "A". It is still the most readable convention for a tier list because viewers do not need a key. But the format is not locked to it. Emoji tiers (🔥 / 👍 / 😐 / 👎 / 💀) read faster on a phone; grade tiers (A+ / B / C / D / F) work for school-adjacent topics; medal tiers (🥇 / 🥈 / 🥉 / 👎 / ❌) work when you want a podium feel at the top and a clear reject at the bottom.
One thing not to do: never use a 6+ tier list on a Story. The chips shrink below the "readable on a screenshot from across the room" line, and the screenshot-to-reshare loop breaks when viewers cannot read the labels. Stick to three, four, or five tiers. Three is a punchy hot take; five is the classic; four is a compromise.
How the Story post actually works
Post the PNG as a normal Story from your camera roll. Add a "Screenshot and show me yours" text overlay, an @mention sticker with your own handle so reshares link back to you, and publish. Viewers will screenshot, move a chip or two in Instagram's own Story composer, and post the edited version back with your tag.
Do not post a second tier list in the same 24 hours. The format only works with time for reshares to trickle in - ten marked-up versions coming back to you over a day beats one fresh tier list buried under five others.