[devsafrun]

line is from naver (korean company), but apparently no one in korea uses line... (100% kakao)

surprised to see Line everywhere else in asia though (seems initial popularity decides a lot for these messenger apps - or some extremely unique features that can't be copied)

[taoistextremist]

Line was originally Japanese, it was just acquired by a Korean company, explaining the lack of market share in that country. I think Kakao predates pretty much all modern messengers, including Kik, so it's kind of surprising they never reached out of Korea very much.