Line  is an application for instant communications on electronic devices such as smartphones , tablet computers  and personal computers . Line users exchange texts , images , video and audio , and conduct free VoIP conversations and video conferences. Line, designed and launched in 2011, reached 100 million users within eighteen months and 200 million users only six months later. Line became Japan's largest social network  in 2013. In October 2014 Line announced that it had attracted 560 million users worldwide with 170 million active user accounts. In February 2015, it announced the 600 million mark had been passed and 700 million were expected by the end of the year. - Via Wikipedia