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How Cambridge Analytica’s Facebook targeting model really worked

niemanlab.org

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Re: How Cambridge Analytica’s Facebook targeting model really worked

#161
post #69
post #41

Spoiler warning. Article punchline ahead. "The whole point of a dimension reduction model is to mathematically represent the data in simpler form. It’s as if Cambridge Analytica took a very high-resolution photograph, resized it to be smaller, and then deleted the original. The photo still exists — and as long as Cambridge Analytica’s models exist, the data effectively does too." That's an eloquent piece of explanati…

If I tell you I like furry porn, is there a way for me to make sure you forget that? This has lots of implications, many of them placing the "blame" on me for telling you this.

I think that's a fair point, but I question if it's an apt comparison to the situation with some big players of the surveillance economy.

Let me make that a bit more convoluted for you:

Let's say, very hypothetically, that you, like most of the general population suck at things technological and just switch off mentally when someone mentions phrases like "social graph" or "Javascript", and I'm a semi-psychopath who plans to make a fortune by scamming dumb fucks like you. I take on my mask of sanity and most endearing nerd T-shirt and appear at your door to give you a FREE robot servant. Except to keep it FREE the robot servant is going to pause what it's doing sometimes and whisper subliminal messages to you from my sponsors. But you're not afraid of stuff like that are you? And all you have to do is sign my brick of legal documents in complexified Legalese, which of course you don't have mental stamina to read through. "But, hey", you think "people are nice and trustworthy and if there was something really bad going on here that would be illegal and punished, and besides what's the worst thing that could happen", and I get your signature and you got your FREE robot.

If you had bothered to learn complexified Legalese and do your reading you'd have noticed you also just approved that the robot spends it's spare computation cycles surreptitiously watching you and getting to know you, and one of the many things it does is it glances over your shoulder when you get your porn fix, and in collaboration with my team of highly trained robot masters it concludes not only that you're into furry porn but also which particular furries really push your buttons. We catalogue this away for future use. Years later, in spite of your technical ineptitude, but maybe let's say because you're really a good people person, you've risen to become the highly respected mayor of your town. Then a business partner of mine who used to work covert operations over at CI6 but now has switched to lucrative private contracting, comes to me asking for the files collected from your robot for a influence gig he's taken on from Toxico, and I sell them to him the data for a suitably juicy sum for a man of you stature. Ex-CI6-guy studies the file with interest and uses it to select two skilled furries he can tell you'll be incapable of resisting and sends them to cross your path at a representation dinner. They very convincingly persuade you to have them over the next weekend your wife's away, and it's WILD(!).

And of course "your" robot is carefully documenting the whole thing, which I also sell to my partner, for an additional cut of the profits from the Toxico job. While you still wrestle with your conscience about whether last weekend was really a Good Thing, someone appears at your office door to propose you use your influence to switch the city energy supply over to a 90-year contract on Toxico's patented owl-burning power plant (with levels of carcinogen emissions they'll never be able to get us for!). Incidentally that someone at your office door has probably also been chosen according to your robot file to be a kind of person you'd have a harder-than-usual time to say no to for one reason or the other, but in the end you still refuse because despite some personal weaknesses you're a decent man, who values and protects your town, it's people and it's environmental surroundings. And then you're informed that someone may have videos you'd really rather not become public. Unless you agree to the Toxico proposal and do so generously, your comfy little life may meet with a sudden and radical change of fortune.

So who's to "blame" in this scenario? I'm sure there's a point where ignorance should be illegal, but I think generally society looks with some leniency on getting deceived. And winding back to the early parts, what does this do for your moral rights to have me remove your data? It was right there on page 200 in crisp, clear letters that you allowed me to watch your porn surfing habits and share that data and derived works with selected partners. You agreed to this! We haven't done anything that we're not allowed to do according to the contract.

...

Re: How Cambridge Analytica’s Facebook targeting model really worked

#162

Earlier quoted context omitted.

That's only accurate in the sense that because an LSTM's hidden layer is much smaller in dimension than the data on which it is trained, there is less information in it. However, it concisely represents a manifold in a much larger dimensional space and effectively captures most of the information in it. It may be (and is) lossy, but don't underestimate the expressive power of a deep neural network.

You're throwing out buzzwords instead of addressing the response. It's dimensionality reduction. You cannot recover the original object. It's like using a shadow to reconstruct the face of the person casting the shadow. Note this has nothing to do with the expressive power of a deep neural network. You are by definition trying to throw away noisy aspects of the data and generalize a lower dimensional manifold from a…

[deleted]

Re: How Cambridge Analytica’s Facebook targeting model really worked

#163
post #34

Earlier quoted context omitted.

One example I can provide is of gun control topics. If you understand someone's mentality on the subject you can decide if they see: 1) An ad with someone breaking into a home and the homeowner defending themselves with a firearm (sell insurance?) 2) A grandfather and grandson on a hunting trip (hunting supplies?) 3) Or maybe gun violence hotline with powerful images. The people seeing these ads are under the assumpt…

> The people seeing these ads are under the assumption that everyone else sees them, not that it's specifically targeted at their personality type. How long will that be true? Do people make that assumption about search results?

There's an occasional thing in UK politics where some public figure X has a go at another figure Y for having offensive ads on their website, without realising about the targeting which means the ads are driven by their own search results.

Re: How Cambridge Analytica’s Facebook targeting model really worked

#164

Earlier quoted context omitted.

There doesn't have to be a security breach for it to be a very bad example of using data collected in one way for a completely different purpose. It violates the 'lawful basis for processing' part of privacy legislation.

Which US legislation?

Cambridge Analytica are in the UK. Which is why the Information Commissioner got a warrant to search their offices.

Re: How Cambridge Analytica’s Facebook targeting model really worked

#165
post #77

Earlier quoted context omitted.

This is exactly it. At least it stops the news from droning on and on about Russia. I thought Clinton spent large amounts of money on data and the Democrats admitted the data was bad or at least that was their excuse. How much did CA pay for this data? I still find it crazy that Trump campaign spent 30% of what Hillary did and still won. The Russians used 100k$ worth of ads to sway the election. This stuff doesn't t…

It doesn't have to add up, most people are too busy with their real lives to manually search and find reliable details (what we get from the media is not reliably unbiased or true), and then read and understand them, so they believe what they see and hear repeated over and over on the TV, radio, and newspaper: the American President is controlled by Vladimir Putin. Even most smart people don't seem to care about actu…

We can freely infer things just from reading his own Twitter feed. Such as the silence of the Salisbury poisoning vs. the instant reaction to other UK terrorist incidents.

Re: How Cambridge Analytica’s Facebook targeting model really worked

#166
post #12

Earlier quoted context omitted.

> What exactly do you show to someone to make them more likely to go and vote if they are inclined to vote your way, or make them stay at home otherwise? Qualitatively: show things that get them angry. Quantitatively: test and control pop splits.

How do you test anything? There's only one vote, you can't iterate.

Geography, at a first pass, over multiple elections. This is how TV testing works. Pick "similar" geographies and run your marketing in one. If the effect is large enough, it pops out. Not quite a diff-in-diff, but a start.

Or don't look at votes, look at candidate likes and shares over time, especially as they shift.

The defined metric doesn't have to be "propensity for this individual to vote for a candidate." It can be "percentage delta over untreated markets compared to prior campaigns."

Re: How Cambridge Analytica’s Facebook targeting model really worked

#167
And we can't blame the companies because we agreed our data to be monitored when we installed the apps and granted permissions. Facebook and Google has taken so much of our data and knows more about our behavior than we ourselves. Even if I demand my data to be removed I don't know if they will 'actually' delete it.

Re: How Cambridge Analytica’s Facebook targeting model really worked

#169

Earlier quoted context omitted.

It became a "problem" because it helped Trump win.

This answer ignores some known details of the story. Cambridge Analytica didn't just buy targeted ads from Facebook. They used a sockpuppet to release a fake "take a personality profile" app, which then allowed them to gather tons of data against the Facebook terms of use. The CEO of Cambridge Analytica has also been recorded telling a (fake) potential client that they routinely blackmail people using prostitutes and…

I find it hard to believe that the American public is up in arms about someone violating Facebook's terms of use.

Re: How Cambridge Analytica’s Facebook targeting model really worked

#170
post #165

Earlier quoted context omitted.

It doesn't have to add up, most people are too busy with their real lives to manually search and find reliable details (what we get from the media is not reliably unbiased or true), and then read and understand them, so they believe what they see and hear repeated over and over on the TV, radio, and newspaper: the American President is controlled by Vladimir Putin. Even most smart people don't seem to care about actu…

We can freely infer things just from reading his own Twitter feed. Such as the silence of the Salisbury poisoning vs. the instant reaction to other UK terrorist incidents.

Oh please. His administration threw out 60 ambassadors in response to this very incident, and this is hardly the first instance of them acting against Russian interests. This paranoid Manchurian Candidate stuff needs to die already.

https://www.lrb.co.uk/v40/n01/jackson-lears/what-we-dont-tal...

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