KakaoTalk
http://www.kakao.com/

KakaoTalk is a downloadable software application for mobile devices that allows its users to send and receive messages including photos, videos, voice messages, URL links, and contact information, both on a one-to-one basis and in groups, all for free. To use the application, you only need to enter your phone number without registering or logging-in. This will be added to the tools section of Research Resources Subject Tracer™ . This will be added to Entrepreneurial Resources Subject Tracer™.