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A comment on Facebook will reveal who uploaded your contact info for ad targeting. Parent comment

Re:Facebook will reveal who uploaded your contact info for a... by fivre on Wednesday February 06, 2019 @11:14PM (#19102941)
Speculation elsewhere (a Twitter thread I've since lost) is that car dealerships are simply uploading every possible US phone number as a "contact". It seems reasonable, and I can't really think of other reasons car dealerships in states I've never visited have added me (or at least some info Facebook associates with me) as an ad target.
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Re:Facebook will reveal who uploaded your contact info for a... by mgpc on Thursday February 07, 2019 @12:21AM (#19103195)
Why would this help them? Facebook already lets you target by geography, they could just target all US residents much more easily.
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Re:Facebook will reveal who uploaded your contact info for a... by onion2k on Thursday February 07, 2019 @01:02AM (#19103370)
Advertisers want more control over who they target than just geographic regions. I'd bet that Facebook let's you select demographic targeting using all of the information they hold on your contacts, so by uploading every phone number you can target people based on geography, age, income, family size, etc.
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Re:Facebook will reveal who uploaded your contact info for a... by hopler on Thursday February 07, 2019 @08:54AM (#19105183)
But you can't target demos for users not in your contacts? That makes no sense.
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