Twitter Pauses Phone Number Matching After Security Lapse

Contact information was used for targeted advertising

Twitter has temporarily suspended tools that allow marketers to match phone number lists with Twitter users after disclosing that personal information they’d provided for account security purposes had been used for targeted advertising.

The lapse, which Twitter announced Tuesday night, meant advertisers uploading their marketing lists to Twitter’s Tailored Audiences tool were able to match customers with their email addresses and phone numbers, which they had shared to keep their accounts safe through methods like two-factor verification.

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