KakaoTalk is big in S Korea. LINE is big in Japan. LINE has 300 million users, with 50 million in Japan. As far as I know, both are very profitable through sal

KakaoTalk is big in S Korea. LINE is big in Japan. LINE has 300 million users, with 50 million in Japan. As far as I know, both are very profitable through sales of digital goods like stickers etc.