Kakao—South Korean regulator and civic group opened probes into Kakao's 'Brand Messages' ad service over phone-number matching without adequate consent
South Korea's Personal Information Protection Commission opened a field investigation and the Seoul YMCA Civic Relay Center filed a formal complaint on October 12, 2026 alleging that Kakao's 'Brand Messages' advertising service, which lets businesses message KakaoTalk users who have not added their channel as a friend, matches phone numbers supplied by advertisers against KakaoTalk accounts to identify ad targets without specific user consent, shares user engagement data (views/clicks) back to advertisers without clear consent, and lacks a comprehensive opt-out mechanism. Spam complaints about Brand Messages rose roughly 2.5x in 2026 (94,947 complaints, Jan-Jul) versus the prior comparable period, and related regulatory violation cases rose from 2 in 2025 to 22 in 2026. Kakao maintains the service operates on recipients' prior consent under the Information and Communications Network Act.
Scoring Impact
| Topic | Direction | Relevance | Contribution |
|---|---|---|---|
| User Privacy | -against | primary | -1.00 |
| Overall incident score = | -0.572 | ||
Score = avg(topic contributions) × significance (medium ×1) × confidence (0.57)
Evidence (1 signal)
Civic group files privacy complaint, regulator probes Kakao's Brand Messages ad targeting
The Seoul YMCA Civic Relay Center filed a complaint and South Korea's Personal Information Protection Commission opened a field investigation into whether Kakao's Brand Messages service unlawfully matches advertiser-supplied phone numbers against KakaoTalk accounts without adequate consent.