I had a discussion about high-end coffee machines and looked one up on phone (not buying one!). Only FB app on phone is WhatsApp. Went on computer (guest mode on chromebook) to Facebok and I saw the very very very first high-end coffee maker ad in my life. Any plausible path?
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good q for
@Chronotope; does FB allow targeting by search via their own tech, or is this a third party thing that they’ve onboarded? -
IP registered in account, IP hits a pixel, join on IP, target with ad. That's pretty standard. Part of the package most DMPs sell too.
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Fingerprint that can be compared between “signed out web hit” (even in incognito) and “signed in WhatsApp install” seems probable
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Doesn’t need to be 100% to be useful, could be heavily IP-dependent but also mix in e.g. device screen size
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From the paper I cited: "The result of p=0.02 indicates that the null hypothesis should be rejected… the deviation of both distributions is statistically significant at the 0.05 level. This finding suggests that we successfully identified instances of cross-device tracking".
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(Btw, although I'm a co-author, my then-PhD student did the interesting work on my side of the collaboration (two professors, each with a PhD student).)
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