The aim of this research is to examine the concept of microblog as a new communication tool and present the current status of the microblogging services in Korea with reference to Twitter. Focusing on Twitter, this study finds out that microblog is the derivation of existing personal media such as blog, which attributes a computer-mediated communication and merges the various types of diverse mass media. Importantly, this new communication reflects our language and culture in the present society. Moreover, this type of communication style in microblog functions as not only self-expression but also social media. However, in some cases, created a big problem with false information content due to the rapid distribution is that there may be an innocent victim. In addition, regarding the violation of personal privacy and publicity, which will be a matter of debate continuously. Finally, the use of SNS and its language, culture and communication in modern society, projecting an image of us as well as communications in the future at the same time.