Sina micro blog was launched by Sina site in 2009, which provide services like Twitter micro-blog site. Users can publish private information and upload pictures through page, WAP page, SMS/MMS messages. Sina micro-blog can be understood as a "micro blog" or "word blog". Users can conclude a sentence from things which they saw, heard and thought, then send to their friends to let them know at the first time. You can also concerned about your friends' information which they released. As the end of October, 2010, the amount of Sina micro-blog reached 50 million, also 25 million micro blog are published by users everyday. Therefore, it can provide a communication stage to promote the users to exchange information. Plus, the most feature of Sina micro-blog is that there are so many public celebrity in this stage which include famous sport stars, business executives and media people, they renew the private information continually.