Twitter says user data meant for security purposes may have gone to advertisers
https://www.reuters.com/article/us-twitter-privacy/twitter-says-user-data-meant-for-security-purposes-may-have-gone-to-advertisers-idUSKBN1WN2FJ
Twitter Inc said on Tuesday email addresses and phone numbers uploaded by users to meet its security requirements may have been 'inadvertently' used for advertising purposes.