Wikipedia
KakaoGroup
KakaoGroup is a Mobile Group SNS launched by KakaoTalk 2013. During January 2015, Kakao released the PC web version of KakaoGroup service to enhance enclosed type SNS. KakaoGroup is a private group communication app that operates together with its messaging service. This standalone app was specifically designed for messaging among groups of friends, acquaintances and colleagues. While other competing apps have built-in group chat functions, the groups in KakaoGroup are private. The app is available for both iOS and Android and offers everything that you are ever likely to need for group chats. There is media sharing, a group-specific news feed, and support for the popular Kako Emoji.