This news about Meta retiring Nielsen DMAs for Comscore Markets reminded me of a story my partner Ohad told me when he first joined a publicly-traded healthtech brand. It’s a story about what happens when you trust your data — and your data is lying to you.
Half the Picture Is Worse Than No Picture
When Ohad stepped into the role, he pulled up Google Analytics and Mixpanel and immediately saw something that didn’t add up. A massive chunk of traffic was being labeled “direct.” Not a little. Half.
He knew the brand wasn’t driving that kind of organic pull. Not yet. So instead of accepting the data at face value, he started asking why.
The consequences of ignoring it were real. The company was running paid campaigns on Facebook and Google Ads. But because attribution was only capturing 50% of the picture, the campaigns looked like they were underperforming. CAC numbers were inflated. LTV per channel was impossible to calculate with any confidence. The marketing team was making multi-thousand-dollar decisions based on half a dataset.
That’s not a reporting problem. That’s a strategy problem.
Where the Data Was Actually Going
Ohad started pulling the threads. One of the biggest culprits was Facebook’s link shimming — a process where users get redirected through an intermediary URL before hitting the landing page. By the time they arrived, the UTM parameters had been stripped clean. The traffic showed up as “direct.” It wasn’t. It was paid. It just looked invisible.
He found a workaround that preserved UTMs through the redirect. Then he went further — building unique ID checkpoints throughout the entire funnel. Every user, at every stage, could be traced back to their original source. Even if attribution broke down at one point in the journey, the ID trail kept the story intact.
In two to three weeks, attribution went from 50% to over 99%.
Leadership didn’t just like the result. They were ecstatic. For the first time, they could see exactly which channel, campaign, and ad was driving real customers — and at what cost.
Why Meta’s DMA Change Should Put You on High Alert
Here’s why this story matters right now. Meta is retiring Nielsen DMAs and replacing them with Comscore Markets for geo-targeting. That means API structures are changing. If your team doesn’t update the integration, you’re going to see broken attribution — traffic and conversions that disappear into the “direct” bucket, just like Ohad’s did.
It’s not a dramatic failure. It’s a quiet one. Your dashboards will still load. Your reports will still run. The numbers just won’t mean what you think they mean.
Most teams won’t catch it for weeks. Some won’t catch it for months. By then, budget decisions have already been made on bad data.
The fix isn’t complicated. Audit your UTM parameters now. Check your API connections before the transition hits. Build ID checkpoints into your funnel so you have a backup trail when redirect chains strip your tags.
Attribution isn’t a technical detail you hand off to a developer and forget about. It’s the foundation every single marketing decision sits on. Get it wrong, and you’re not running performance marketing. You’re running expensive guesswork.
Ohad fixed it in three weeks at a healthtech company with real budget on the line. The Meta transition gives you a deadline. Use it.
