The development of Internet at present is focusing on the social media applications. One of the most important contributions of social media is its leading to the change of information distribution model. The social media brings people together and makes social relationship a key factor in content generating and transforming. The collaboration of users as a self-organization contributes to the self-revising and evolution of social media. In the new time of social media, UGC will become a strong challenger to the professional generated content, and social media platform may become a personal portal of user on the internet, which may be a threat to the traditonal portal sites. <<