一是发现了受众，受众开始进入传播学视野，打破原有的大众受众观，提出群体

First, find the audience, the audience began to enter the field of vision of communication, breaking the original concept of the mass audience, the audience group proposed concept; the second is found in the communication process "two-step flow of communication flow", that information does not flow directly from the media audience, but "the flow of information from the broadcast and print media opinion leaders, opinion leaders and then passed to those from less active people"; the third is found in the limited dissemination of results of the public, for the dissemination of results and relationships with potential influence, open the limited effect of age milestone in the dissemination of research results.

First, the discovery of the audience, the audience began to enter the field of communication, break the original view of the mass audience, put forward the audience view, and the second is to discover the process of communication "two-level communication flow", that is, information is not directly from the media to the audience, but "information from the radio and print media to the opinion leader, Pass it from opinion leaders to less active people"; the third is to discover the limited effect of mass communication, and interpersonal relationships have a potential impact on the effect of communication, opening up the era of limited effects in the milestones of communication effect research.

The first is to discover the audience, and the audience begins to enter the field of communication, breaking the original view of mass audience and putting forward the view of mass audience; the second is to discover the "two-level communication flow" in the process of communication, that is, information does not flow directly from the media to the audience, but "information flows from the broadcast and print media to opinion leaders, and then from opinion leaders to those less active groups"; the third is to send Now that the effect of mass communication is limited, and interpersonal relationship has potential influence on the effect of communication, the era of limited effect in the milestone of communication effect research has been opened.