Garrett Johnson
@garjoh.bsky.social
1.4K followers 1.1K following 110 posts
Marketing professor @BUQuestrom researching digital marketing: privacy & ad effectiveness. 🇨🇦,🇺🇸. garjoh.com
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🧵1/ Google’s Privacy Sandbox promises to replace third-party cookies with privacy-preserving tech. But does it preserve publisher revenue?
We partnered with @weareraptive to analyze 200M+ ad impressions across 5,000+ sites in the CMA-Google field experiment.
Here's what we found 👇
Notably, Chrome announces its support of the W3C’s proposed interoperable Attribution standard.

In sum, PETs lives on in advertising, but are focused on measurement rather than targeting.
Google is largely shutting down the Privacy Sandbox.
Surviving: CHIPS, FedCM, Private State Tokens
Out 💀 : (Anything you’ve heard of!) Topics, Protected Audience API, Attribution Reporting API, Private Aggregation, Related Web Sites…
privacysandbox.com/news/update-...
Update on Plans for Privacy Sandbox Technologies
In this October 2025 announcement, the Privacy Sandbox team shares updates on plans for Privacy Sandbox technologies.
privacysandbox.com
Today, the UK Competition & Markets Authority decided to release Google from its Privacy Sandbox-related commitments.
Read more: assets.publishing.service.gov.uk/media/68f213...
assets.publishing.service.gov.uk
Reposted by Garrett Johnson
SOUTH CAROLINA… “Judge Goodstein was walking on the beach when the fire started. Her husband, Arnie, was in the house with children and perhaps grandchildren. The family had to escape by jumping from a window or balcony...” www.dailymail.co.uk/news/article...
Explore this gift article from The New York Times. You can read it for free without a subscription. www.nytimes.com/2025/08/26/o...
Opinion | Where’s Your Evidence, Mr. President?
www.nytimes.com
Reposted by Garrett Johnson
Horrific. mRNA vaccines have saved millions of lives and could save millions more.

“I don’t think I’ve seen a more dangerous decision in public health in my 50 years in the business,” said Mike Osterholm, a UMN expert on infectious diseases & pandemic preparations.
www.huffpost.com/entry/rfk-va...
Reposted by Garrett Johnson
Janet Yellen's husband & Econ Nobel Laureate George Akerlof:

"...when presidents flip the board, it’s not just a game that ends. It’s the pieces of democracy that get scattered to the floor."
www.nytimes.com/2025/08/03/o...
Reposted by Garrett Johnson
Reposted by Garrett Johnson
Marco Rubio, Stephen Miller, Kirsti Noem, Joseph Mazzara, Emil Bove, Drew Sargent, and everyone else involved in planning, executing, and obstructing justice around the CECOT imprisonments are responsible for Andry's torture and rape.

Each bears a share of the blame. Don't ever let them forget it.
Reposted by Garrett Johnson
This is Goose. He's here to perform his own rendition of "Piano Man" by Billy Joel. 13/10 please enjoy
Reposted by Garrett Johnson
He lived and worked here for 40 years. My god I am so ashamed at what's happening.
Reposted by Garrett Johnson
Reposted by Garrett Johnson
Can Privacy Technologies Replace Cookies? Ad Revenue in a Field Experiment.
This study suggests that current #privacy-enhancing technologies fall short of fully compensating for the economic value of cookies.
http://spkl.io/63325fCCOL
@garjoh.bsky.social @sjkobayashi.bsky.social
9/ 🇪🇺 Notably, the EU faces greater regulatory pressure under #GDPR.
➡️EU has more impressions without cookies (43%) and experiences greater revenue losses when cookies are removed (-66%).
➡️Sandbox performs better in the EU: recovering 22% of lost revenue.
8/ 🕛 Second: latency. On-device auctions are slow.
The 75th percentile ad latency under Privacy Sandbox is 5.7 seconds — more than 2x slower than the other groups. That delay reduces impressions served by 2.85%, yielding no revenue in those cases.
7/ 📦 Why so little recovery?
First: A minority of adtech vendors adopt the Sandbox, placing a ceiling on revenue upside. In our data, 7% of impressions are sold via the Protected Audience API & >27% returned Topics API categories.
6/ 🚑 Can Privacy Sandbox recover the lost revenue?
Not much. Publisher revenue falls 28% under Sandbox—meaning it recovers just 4.2% of what cookies provided.
5/ 🤔 These losses are smaller than prior studies that found ~50% drops.
Why? Raptive uses alternative identifiers—like hashed emails—which soften the blow when cookies are gone.
bsky.app/profile/garj...
For no particular reason, I'm re-upping my review of studies that calculate the value of browser cookies.
Our 2020 Marketing Science paper contributes the median estimate: ad prices fall 52% without cookies.