* ====Summary====


  * Anonymity lowers the reliability of Internet communication when accountability provide reliability of using Internet; Anonymity keeps Internet a Cyberspace when accountability makes the Internet a real world. Anonymity saves the user from accountability in bad situations like online criminals but also encourages it; accountability saves customer from online fraudulence but also gives spam producers chances to do their business.
  * It is not easy to determine which place should be anonymity or accountability since in some situations anonymity means unreliable and accountability means no privacy. Here comes a dilemma of Internet.