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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 Legogris on Thursday February 07, 2019 @01:50AM (#19103520)
Did you add your phone number to your account? Or have a WhatsApp/Instagram/Tinder account that does? Contact info can be more than just e-mail.
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Re:Facebook will reveal who uploaded your contact info for a... by Vinnl on Thursday February 07, 2019 @02:40AM (#19103693)
If it's a phone number you don't even have to do it yourself. If any of your friends have linked their contacts entry of you to your Facebook account and have one of Facebook's apps installed, Facebook can now know your phone number.

Edit: They didn't have the phone number, according to the data exporter. Pretty plausible explanation here: https://news.ycombinator.com/item?id=19103490

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