Twitter on Tuesday apologised after “inadvertently” using phone numbers and email addresses uploaded by users to meet its security requirements may have been used for advertising purposes.
We recently discovered that when you provided an email address or phone number for safety or security purposes [for example, two-factor authentication] this data may have inadvertently been used for advertising purposes,” Twitter said in a statement on Tuesday.
When an advertiser uploaded its marketing list, some users were being matched to those lists based on their security email or phone number.
“This was an error and we apologise.”
None of the user data was shared with partners outside the company, and it was unclear how many people were affected, the San Francisco-based company said.
Social media companies, including Twitter and Facebook, have faced heat from users and regulators globally on how their platforms handle user data.