User Number Exceeds 50 Million Worldwide for NHN Japan's Free Calling and Messaging App LINE

User Number Exceeds 50 Million Worldwide for NHN Japan's Free Calling and Messaging App LINE PR Newswire TOKYO, July 26, 2012 TOKYO, July 26, 2012 /PRNewswire/ -- NHN Japan Corporation announced on July 26 that the number of registered users for its free calling and free messaging app 'LINE' (http://line.naver.