The Internet, unlike other media such as TV or radio, is inherently (本身固有地) a "two-way" medium. A company user can communicate to the rest of the world with ease. It has created a sense of "global community" that’s found almost nowhere else. People around the world post web sites. exchange e-mail, and participate in on-line chats. Going on-line means not just surfing the Web and reading e-mail. It means getting involved in the whole Net community.