LINE Yahoo Deletes 3 Years of Ad Data Storage Records
The deletion of legally mandated storage records, even without a confirmed leak, raises renewed questions about LINE Yahoo's governance of advertising-related data after a series of prior issues.
Reporting from 1 source: ASCII.jp.
LINE Yahoo announced on July 24 that records required under the Act on the Protection of Personal Information were deleted from its advertising targeting services, including LINE Ads and LINE Official Accounts. The deletion covered records from December 15, 2022, to June 9, 2026, caused by a data management review error. The system is corrected, and no leaks or impacts on ad delivery have been confirmed.
LINE Yahoo said the deleted records were part of legally required storage records, not user data needed for ad delivery or service operations. The company stated that customer data uploaded by companies, such as email addresses and phone numbers, is immediately deleted after matching, and no inappropriate sharing, secondary use, or information leaks have been confirmed.
The company has corrected the system, and records from June 10, 2026, onward are being saved properly. It is accepting inquiries through a dedicated contact point and apologized to users.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.
Sources
- ASCII.jp LINE、広告データの保存記録に不備 3年半分を誤って削除