Social Media's Measurement Gap Is Hiding Where the Real Ad Value Lives

A version of this article was original featured in AdExchanger

I've been on both sides of the media table for most of my career. First buying it, now selling it. I ran media buying teams for brands like Procter & Gamble, Squarespace, and Chase Bank before moving to Tatari, where as VP of Media I now negotiate our largest streaming and linear deals and push networks like Paramount Global, NBC, and Disney to sell programmatic, DR, general, local, and upfront inventory as one unified offering instead of four separate silos. I've sat across the table from platforms that make their case in a clean dashboard, and I've sat across the table from TV networks still building the infrastructure to make that same case. So when I see headlines about social media's ad dominance, I always question exactly what they are measuring and how.  

A report dropped last month from eMarketer that made me curious. Social networks will capture 27.7% of all US ad spend this year, despite accounting for just 12.5% of the time Americans spend with media. Convergent TV (linear and CTV), where consumers spend 38.5% of their media day, gets 18% of budgets. Per commentary, "the pendulum is swinging back to the feed, signaling that the crown of digital video dominance is going to social media."

The instinct is to say social is outperforming every other channel. But I don't think that's the full story. After eight years at Tatari working with over 300 diverse brands at the intersection of TV and performance marketing, what we might be seeing is degrees of measurement confidence — and it's leaving opportunity on the table.

Why are advertisers buying into social?

Meta's attribution infrastructure is clean, fast, and easy to defend in a spreadsheet. A brand CMO can walk into a board meeting with a ROAS number, a cost-per-acquisition, and a clear story. That's not a small thing. Internal budget decisions rarely go to the channel that works best — they go to the channel that can be proven most clearly.

But much of it is an illusion. When a platform owns the measurement, it is more likely to push the narrative that the ads are working. The measurement models make that easy to do. Last-click and view-through attribution routinely take credit for conversions that would have happened anyway. The number is precise, but that doesn't make it true. The question that actually matters isn't "what did the platform report?" but "what did the ad cause?" That's incrementality, and it's a fundamentally different measurement than attribution. A clean ROAS dashboard can coexist with very little incremental lift, and most brands never pressure-test the gap between the two.

The same gap explains what's happening to television, just in reverse. The results are often there on TV, and platforms like Tatari exist specifically to surface them. But the data ecosystem across the broader CTV landscape hasn't caught up to the demand for accountability. That asymmetry is driving dollars toward social not purely on merit, but on comfort.

Not all walled gardens are equal

Here's where it gets more nuanced. The platforms winning ad dollars — Meta, Google/YouTube — are also walled gardens. They don't share their data with third parties. But they've invested enormously in measurement infrastructure within their walls. Brand Lift studies, multi-touch attribution, search lift, DV360. Advertisers can prove ROI inside those ecosystems, and so the money flows.

Streaming platforms are at different stages of that same journey. Amazon has made strides — shopping-signal enhanced attribution, multi-touch attribution across their DSP. The trajectory is right. Others are earlier in the process, still building the infrastructure that would allow advertisers to make the same case for streaming inventory that they can for social. The result is an uneven measurement landscape across CTV at exactly the moment streaming is winning the living room.

But here’s why we are stuck. Even the best in-garden measurement is still self-reported, and none of it is comparable across platforms. ROAS from Meta, or Amazon, or Netflix aren't measured the same way against the same outcome. So even if every walled garden eventually builds world-class measurement inside its own walls, advertisers still can't answer the only question that matters: across my entire media plan, where is the next dollar most incremental? The fix isn't waiting for each platform to grade itself better. It's independent, cross-platform measurement that puts every channel on equal footing. 

This plays out directly in the numbers. When you look at where conversions actually originate, TV is quietly doing work that social takes credit for. In a Tatari analysis of 100 brands measured on social-driven traffic, 9 out of 10 saw higher conversion rates from visitors who had seen a TV ad in the prior week. 60% saw a lift of more than 50%, and a third saw conversions more than double. The customer converts on Meta, so Meta’s dashboard claims the victory. But the TV ad is part of what moved them. 

Platforms with limited measurement transparency attract far fewer ad dollars relative to the time consumers spend on them. The gap between attention and investment isn't random — it maps almost precisely to measurement confidence.

Where the industry goes from here

Streaming now accounts for the majority of TV viewing time in the US, and walled garden publishers are an increasingly significant piece of that inventory. As they grow, so does the measurement gap — not because CTV can't be measured, but because each platform's data lives behind its own walls, with its own methodology, on its own timeline.

The broader CTV ecosystem is starting to close that gap. At Tatari, it's the problem we've spent nearly a decade working on — building measurement across a fragmented CTV landscape so ad dollars can actually follow the audience. The shift back toward social may be real, but it reflects where measurement stands today, not necessarily where the real media value is.

FAQs

Why does social media get a bigger share of ad budgets than the time people spend on it?
Social platforms have built clean, self-contained attribution infrastructure — ROAS dashboards, last-click and view-through data — that's easy for marketers to defend internally, even when it doesn't reflect true incremental impact.

What's the difference between attribution and incrementality in advertising?
Attribution measures what a platform reports as a conversion path; incrementality measures whether the ad actually caused a sale that wouldn't have happened anyway. A channel can look strong on attribution while producing little real incremental lift.

Does TV advertising actually drive conversions credited to social media?
Yes — in a Tatari analysis of 100 brands, 9 out of 10 saw higher conversion rates on social-driven traffic from users who'd seen a TV ad in the prior week, with 60% seeing a lift over 50%.

Why is CTV measurement harder to prove than social media measurement?
CTV inventory is fragmented across walled gardens (Netflix, Amazon, YouTube, etc.), each with its own self-reported methodology and no cross-platform standardization, making it hard to compare ROAS across streaming platforms.

What is independent cross-platform measurement, and why does it matter?
It's third-party measurement that evaluates every channel — social, CTV, linear TV — against the same standard, so advertisers can see where the next ad dollar is genuinely incremental rather than trusting each platform's self-graded results.