The social network Twitter acknowledged using its users' phone numbers —which were asked for security reasons— with promotional purposes. The company asked its users to provide their phone numbers and e-mail directions to improve their accounts' protection; using the two-steps authentication process. However, this data ended up being used with specific advertising purposes, although Twitter ensures that it was "not intentional".   The security failure offered the advertisers a group of users' phone numbers, but their personal information was not revealed. However, the...