"Japan -based Line, a free messaging and game app, in May said revenue jumped to Y 5.8 Billion (A$63 Million) in the first quarter of this year from Y 3 Billion in the previous quarter. Half of the revenue - admittedly, mostly from Japan - came from in-app purchases"
Source: Jackpot gateway by Micheal Bleby
BRW Magazine
August 1-7 2013, Page 41