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Re:Facebook Buying WhatsApp for $16B in Cash and Stock Plus ... by nolok on Thursday February 20, 2014 @01:54AM (#7269328)
Some countries use Line rather than WhatsApp
Re:Facebook Buying WhatsApp for $16B in Cash and Stock Plus ... by gbog on Thursday February 20, 2014 @02:38AM (#7269451)
Or WeChat, which is quite big in China.
Re:Facebook Buying WhatsApp for $16B in Cash and Stock Plus ... by balladeer on Thursday February 20, 2014 @09:58PM (#7275190)
KakaoTalk is not even mentioned. It's one of the biggest player and probably more famous than anything in S Korea.

ChatOn has some userbase too.

Re:Facebook Buying WhatsApp for $16B in Cash and Stock Plus ... by dba7dba on Friday February 21, 2014 @01:37PM (#7278535)
Supposedly KakaoTalk has 90% market penetration in S Korea.