Japanese messaging app Line revealed that it now has 400 million registered users. While the app is most popular in Japan, it boasts having over 10 million users in 10 countries – including Taiwan, Thailand, Malaysia, Mexico, and the US. The company also revealed today that the chat app hit new highs in 2014 in terms of usage – 10 billion messages in one day; 1.8 billion stickers sent in a single day; and over 12 million online calls in one day.