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Twitter admits your phone number may have been used for targeting ads


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Twitter is only supposed to use phone numbers for two-factor authentication, but it appears to have been unintentionally used for more. The social network has learned that phone numbers and email addresses provided for safety and security (including two-factor authentication) might have "inadvertently" been used for ad purposes. Advertisers on Twitter can customize promos based on uploaded marketing lists, and Twitter may have matched people on those lists based on phone digits and email addresses that were supposed to be off-limits. "This was an error," Twitter said.


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