It has come to my attention that many of the people complaining about #Firefox's #PPA experiment don't actually understand what PPA is, what it does, and what Firefox is trying to accomplish with it, so an explainer 🧵 is in order.
Targeted advertising sucks. It is invasive and privacy-violating, it enables populations to be manipulated by bad actors in democracy-endangering ways, and it doesn't actually sell products.
Nevertheless, commercial advertisers are addicted to the data they get from targeted advertising. They aren't going to stop using it until someone convinces them there's something else that will work better.
"Contextual advertising works better."
Yes, it does!
But, again, advertisers are addicted to the data, and contextual advertising provides much less data, so they don't trust it.
What PPA says is, "Suppose we give you anonymized, aggregated data about which of your ads on which sites resulted in sales or other significant commitments from users?"
The data that the browser collects under PPA are sent to a third-party (in Firefox's case, the third party is the same organization that runs Let's Encrypt; does anybody think they're not trustworthy?) and aggregated and anonymized there. Noise is introduced into the data to prevent de-anonymization.
This allows advertisers to "target" which sites they put their ads on. It doesn't allow them to target individuals.
In Days Of Yore, advertisers would do things like ask people to bring newspapers ads into the store or mention a certain phrase to get deals. These were for collecting conversion statistics on paper ads. Ditto for coupons.
PPA is a way to do this online.
Is there a potential for abuse? Sure, which is why the data need to be aggregated and anonymized by a trusted third party. If at some point they discover they're doing insufficient aggregation or anonymization, then they can fix that all in one place.
And if the work they're doing is transparent, as compared to the entirely opaque adtech industry, the entire internet can weigh in on any bugs in their algorithms.
Is this a utopia? No.
Would it be better than what we have now? Indisputably.
Is there a clear path right now to anything better? Not that I can see.
We can keep fighting for something better while still accepting this as an improvement over what we have now.
The documentation under the "Learn more" link next to the "Allow websites to perform privacy-preserving ad measurement" checkbox in Firefox preferences explains very clearly what it is and how it works. Asserting that people who read that and are indignant about it being enabled by default just... "don't actually understand" it is absurdly insulting and basically gaslighting.
The vast majority of people never read the source material for anything, and that's usually perfectly fine. They learn new things because other people told them about it. Most of the time this works great. Sometimes small changes in the explanation can make a big difference, and the game of telephone can have big impacts on people's perception of a thing. It's almost certain that most people complaining haven't read the explanation, and in this particular situation it's an issue.
Edit: opt-out shenanigans notwithstanding.