(LEAD) Naver's ad revenue neared 3 trillion won in 2016

(ATTN: ADDS the communication watchdog chief's comments in last 3 paras)

SEOUL, Jan. 12 (Yonhap) -- South Korea's largest Internet portal Naver Corp. is forecast to have raked in nearly 3 trillion won (US$2.53 billion) in revenue generated from advert