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Jonne Arjoranta

"They found that when a user gives Facebook a phone number for two-factor authentication or in order to receive alerts about new log-ins to a user’s account, that phone number became targetable by an advertiser within a couple of weeks."

Facebook uses information provided for security purposes to target more ads.

https://gizmodo.com/facebook-is-giving-advertisers-access-to-your-shadow-co-1828476051