this post was submitted on 09 Sep 2024
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I guess my question is why they upload hashed personal information instead of not uploading the information at all.
I found some answers searching the Facebook help pages.
https://www.facebook.com/business/help/112061095610075?id=2469097953376494
https://www.facebook.com/business/help/341425252616329?id=2469097953376494
Long story short, though not explicitly stated, the idea here seems to be that they want to match name, email, phone number, address information you provide against records they already hold. The hashing is done by Facebook and is ostensibly to make sure Facebook already holds the info. I.e. they want to match the phone number to one they already hold, not add the phone number to an account they didn't have it for.
Long story short, nothing in here is anonymous, they don't pretend it's anonymous as the point is to match against real profiles, and IRD seem to have misunderstood.