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  "note": "Another in the endless series of findings on how Facebook uses your data to target you. \r\n\r\n> I was helping him test the theory by targeting him in a way Facebook had previously told me wouldn’t work. I directed the ad to display to a Facebook account connected to the landline number for Alan Mislove’s office, a number Mislove has never provided to Facebook. He saw the ad within hours.\r\n\r\nThey are even doing this with data you give them for security purposes.\r\n\r\n> 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.\r\n\r\nThe [EFF highlighted](https://www.eff.org/deeplinks/2018/09/you-gave-facebook-your-number-security-they-used-it-ads) this terrible use of security information for advertising targeting as well.",
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