任何一种传媒,只有当它达到一定的使用规模时,才有可能在传播领域中显示其能量。按照美国学者的说法,这一数量标准为:一种传媒使用人数达到全国人口的20%即五分之一以上,才能被称为大众传媒。在美国,达到5000万人使用这一规模的大众传媒,广播用了 Any kind of media, only when it reaches a certain scale of use, will it be possible to show its energy in the area of ​​communication. According to the American scholar, the quantitative standard is that a media using 20% ​​or more of the population of the whole country, that is, over one fifth, can be called the mass media. In the United States, 50 million people use mass media of this scale for broadcasting