1 Introduction
As to consumers, Word-of-Mouth has always been one of the most important factors influencing consumer attitudes, but the scope and speed of transmission of the traditional Word-of-Mouth is limited. If companies want to establish their reputation, to achieve the desired effect, it is not a short period of time to complete. The arrival of the Internet age brings unprecedented energy into Word-of-Mouth. The new communication channels based on the Internet technology, such as online forums, networking forum, blog, e-mail, makes all kinds of topics spread quickly.