3-way Battle of Global Messengers, Line, What's App, and WeChat

According to the U.K.'s market research firm Ovum on December 6th,
What's App, Line, and WeChat will rise to be the
big 3 with more than 500 million members
and will become international mobile messengers by 2016.

What's App is a messenger took over by Google. Currently,
it is  widely used in North America.
Line is a messenger made by "Naver," which is called Korea's Google.
It is popular in Japan, Southeast Asia, and Europe.
WeChat is a Chinese messenger. It has only absorb China's domestic market,
but is already the third largest messenger company in the world.

Among these, the biggest issue is "Line," a messenger 
made by Korea's portal company Naver.
50 million Japanese, 10 million from each of Korea, U.S., and Mexico,
and more than 20 million people from Thailand, Spain, Indonesia,
and many others have signed up for Line.
Google's service has never been able to be number 1.
WeChat only stays within China's domestic market and seems to be
absorbed by Line.

Line has long been Japan's national application,
and is now penetrating into the U.S.
A Korean messenger company "Line" can be picked
as one of the firms to pay attention in 2015.