Twitter says user data meant for security purposes may have been used for advertising

Twitter said on Tuesday email addresses and phone uploaded by users to meet its requirements may have been “inadvertently” used for advertising purposes.

The micro-blogging site said the issue was rectified as of September 17, without disclosing how many users were impacted.

“This was an error and we apologize,” the company said in a blog post.

Social media companies, including Twitter and Facebook, have faced heat from users and regulators on how their platforms handle .

Twitter said when advertisers uploaded their marketing lists, it may have matched people on the to their list based on the email or phone number provided by account holders.

The company said the information was not shared with third parties, but was made available internally to allow users to receive advertising.

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