Pinterest's 28-Day Rule: Why Old Pins Stop Working

You have a pin that used to bring in 40,000 monthly views. Now you go look at that pin and it brings you 400.

You did not break anything. Pinterest just explained exactly what's happening, and the explanation is different from the one you've been telling yourself.

The Belief We Need to Say Out Loud

I've heard some version of this on almost every call for months. I got deprioritized. I'm shadow-banned. My website got flagged. Mostly it's the smaller one: I don't know what happened, it used to work.

You have a pin with two years of receipts on it. Saves, clicks, outbound traffic, still relevant. Then it flatlines, and nothing about your behavior changed. So you go looking for the punishment.

The paper describes a system that has nothing to do with punishment.

Pinterest's 28-Day Rule: Why Old Pins Stop Working - Spotify

Pinterest's 28-Day Rule: Why Old Pins Stop Working - Apple

The Rich Get Richer Problem

Pinterest published another paper, this one about what they've been rolling out across the home feed, search, and related pins. Those three surfaces are 92% of every content impression on the platform, so this is Pinterest as a whole.

The problem they built this to fix is one Pinterest had with itself. Recommendation systems reward what already has proof. A pin with two years of engagement looks safe to a ranking model. A pin published 11 minutes ago looks like a coin toss.

So the safe one wins over and over, even when the new one is a better answer to what somebody actually typed. The engineers call it the rich get richer effect.

Left alone, that turns our feeds into a museum. Same pins, same nine accounts, same casserole from 2019. So think of your dead pin as a retirement.

Your New Pin Gets an Automatic Audition

The system is called Pin Equalizer. Pinterest built separate indexes for fresh content and guaranteed that a stream of fresh candidates enters the ranking pipeline every time. What they did not do is reserve a fixed percentage of the results you see. There's no rule anywhere in that paper saying slot four is always a new pin.

In plain language, your new pin now gets an automatic audition. Whether it makes the stage still comes down to ranking.

The Model Stopped Reading the Scoreboard

During training, Pinterest deliberately hides a pin's historical engagement numbers from the model, randomly, pin by pin. They call it engagement feature dropout. Your image and copy carry more weight than they did three years ago, because the model was trained with the receipts taken away.

The model gets handed a pin with the scoreboard taped over, and it still has to guess whether the pin is any good. So it learns the pin itself. The image, the text, the relevance, the intent.

Relevance Gates Your Head Start

Every fresh pin gets a small boost in final ranking, sized by how uncertain Pinterest is about it. Fewer impressions, bigger bonus.

One catch, and it's a big one. On search, that bonus gets multiplied by the relevance score. A fresh pin that doesn't match the query gets almost no boost at all.

Hear what that means for your titles. A clever title on a brand new pin multiplies your head start by a very small number. Say the thing the person typed.

28 Days Is the Whole Window

Here's the number to write down. A pin graduates when it earns a set number of positive engagements within a set number of days. At that point Pinterest treats it as a known quantity and stops running the experiment. Pins that burn through the exploration budget without performing get retired.

Pinterest measures graduation on a 28-day window.

This reframes almost every pinning question I get. Frequency stops being a magic number and becomes about coverage: you want something in the audition at all times. "How long do I wait" already has an answer, and it's a month.

And re-pinning your old winners to new boards does nothing. That pin graduated. Moving it around doesn't put it back in the pool.

Final Pin Drop

Nothing in the paper describes a mechanism for re-exploring content. A pin either graduates and exits, or it gets retired. One-way door, both directions.

So your 2022 winner isn't being retested. It isn't resting or waiting for the right season. The system has no reason to look at it again.

The fix is a fresh pin for that URL. If it didn't take off, change the design and make minor tweaks. Nobody can tell you it was your font turned a certain way. Only Pinterest can tell you, so test.

Your history helps here. Pinterest seeds its guess about your brand new pin using your account's track record before that pin has a single impression.

Go make new pins for the URL that used to be your best one. That's the highest percentage thing you can do this week.

📌 Book a PinChat → laurarike.com/pinchat