With $200 Million in Revenue, South Korea's Top Messaging App Is All Smiley Faces

The KakaoTalk messaging app. Courtesy KakaoTalk

In South Korea, there's no escaping KakaoTalk. The country has a smartphone penetration rate of 73 percent, according to research firm EMarketer, and of those people, 93 percent use the mobile messaging app Kakao, says Nielsen.

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