openning post

http://www.usatoday.com/money/advertising/2005-06-22-viral-usat_x.htm
Originally, its meaning comes from oral marketing that when people feel good about the product, they can talk about it to other people. Therefore, the marketing can be done by customers mouth-to-mouth. In the past, the marketer use viral marketing by providing products free for customers.(actually this free offer is done these days; for example, one film producer can attract a lot of people by making soundtrack free for download). However, the concept of viral marketing has been changed. Viral marketing (also called viral advertising) is a term that describes marketing techniques that the effect of marketing is spread like a virus. Viral marketing is used by methods of “social-networking site, video, flash games, images, etc” With this method, marketers can reach a lot of people.