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A comment on FTC Settlement with Fertility-Tracking App for Facebook/Google SDK Data Sharing. Parent comment

Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by kevin_thibedeau on Wednesday January 13, 2021 @04:47PM (#25768380)
It's worth pointing out that traditional data brokers are able to track menstrual cycles based on purchase activity. Nobody can opt out of this and it's been going on for a few decades. It can be used for ad targeting by presenting the target with the optimal content for each week.
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by SilasX on Wednesday January 13, 2021 @09:33PM (#25771099)
Yes, there was this study about clothing purchase correlation:

https://thechart.blogs.cnn.com/2010/08/05/women-buy-sexier-c...

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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by saagarjha on Wednesday January 13, 2021 @07:12PM (#25769907)
How does this work? Is it that women change their general purchase habits around that time, or that they buy specific products?
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by kevin_thibedeau on Wednesday January 13, 2021 @11:55PM (#25772224)
You run a 28 day autocorrelation and see what pops out. Start with the obvious purchases then artificially synchronize the purchase history of a group of women to be on the same phase and run another autocorrelation on their aggregate purchases to get the non-obvious signal.
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by elliekelly on Wednesday January 13, 2021 @07:56PM (#25770300)
I would imagine women who are buying menstrual products are very likely either about to begin their period or are in the midst of it. Also, things like midol are probably strong indicators.
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by saagarjha on Thursday January 14, 2021 @12:04AM (#25772319)
Hmm, I'm not sure–all the women I know buy massive packs from Costco because it's something that they might as well buy in bulk and save money on. I didn't think of medicine, though–you're probably right about that.
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by viraptor on Thursday January 14, 2021 @12:54AM (#25772638)
Painkillers and chocolate purchases should be slightly correlated.
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by A4ET8a8uTh0 on Wednesday January 13, 2021 @06:16PM (#25769359)
I did not hear about that one. It does sound interesting. Is there some sort of of study discussing it you could link?
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by manicdee on Wednesday January 13, 2021 @07:02PM (#25769809)
For me the canonical example is this story in Forbes about a man who complained to Target about baby-product advertising directed at his teenage daughter.

https://www.forbes.com/sites/kashmirhill/2012/02/16/how-targ...

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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by josefx on Thursday January 14, 2021 @03:10AM (#25773541)
To spoil an important point of the article: They had a personalized Target account and the daughter had been openly buying pregnancy related products for weeks, her father was the only one not aware of it.
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by amptorn on Wednesday January 13, 2021 @07:57PM (#25770314)
Why is that worth pointing out?
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Re:FTC Settlement with Fertility-Tracking App for Facebook/G... by raae on Friday January 15, 2021 @01:31PM (#25794283)
It shows how this could be done for cycle analytics as well...If I remember the target case correctly it was not the buying of a pregnancy test, but general products like more body lotion etc. Things that correlate to the symptoms of the hormons present.
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