Intemet的爆炸性般普及，给美国的经济和社会带来巨大变化。一方面遍布于网络上的虚拟空间构成巨大的媒体，给舆论的形成带来巨大的影响;另一方面在激烈的商战中，人们正热衷于通过网络购物，使电子商务向生活渗透。作为发展信息化的先驱，美国己经感受到网络带来的震撼。第四 The explosive popularity of the Internet has brought enormous changes to the U.S. economy and society. On the one hand, the virtual space all over the Internet constitutes a huge media, which has a huge impact on the formation of public opinion; on the other hand, in the fierce commercial warfare, people are keen on shopping through the Internet and infusing e-commerce into their daily life. As a pioneer in the development of information technology, the United States has felt the shock brought by the Internet. fourth