The worldwide Internet population surpassed 900 million in 2005 (Miniwatts International, 2005). Consequently, the research of effective online communication becomes increasingly important. According to the findings of the Pew Internet and American Life Project (Pew, 2005), as much as 91% of about 135 million Internet users in the US reported sending an e-mail, 40% reported sending instant messages, and 17% chatted in a chat room or in an online discussion. Flanagin and Metzger (2001) have found that the channels for communicating by the Internet receive high ratings in comparison with face-to-face (FtF) and other traditional means of mediated interpersonal and mass communication in terms of the potential to satisfy various personal needs. The obvious consequence is that the use of the Internet extends to both the professional and private lives of its users and enhances their social worlds (Howard et al., 2002).