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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 mrgreenfur on Thursday February 07, 2019 @04:01PM (#19108564)
I would guess that there are 3rd party companies who's business is to match cookie values behind the scenes to email / phone / address / demo data and re-sell it, or sell access to the aggregate db.

Hopefully a federal privacy law will clarify if this is legal at all.

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Re:Facebook will reveal who uploaded your contact info for a... by potatoyogurt on Sunday February 10, 2019 @12:12PM (#19128668)
That is basically LiveRamp's business model. There are other companies who do this as well. See https://en.wikipedia.org/wiki/Data_onboarding
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