(2nd LD) Kakao's Q1 net dips 65 pct on slumping ad biz

(ATTN: UPDATES closing share price)

By Kang Yoon-seung

SEOUL, May 12 (Yonhap) -- Kakao Corp., the operator of South Korea's top mobile messenger KakaoTalk, said Thursday its first-quarter net profit plunged 64.5 percent, as its advertisement business