In this way publicity has come to be a recognized form of social control, and advertising—"social advertising"—has become a profession with an elaborate technique supported by a body of special knowledge.
It is one of the characteristic phenomena of city life and of society founded on secondary relationships that advertising should have come to occupy so important a place in its economy.
In recent years every individual and organization which has had to deal with the public, that is to say, the public outside the smaller and more intimate communities of the village and small town, has come to have its press agent, who is often less an advertising man than a diplomatic man accredited to the newspapers, and through them to the world at large. Institutions like the Russell Sage Foundation, and to a less extent the General Education Board, have sought to influence public opinion directly through the medium of publicity. The Carnegie Report upon Medical Education, the Pittsburgh Survey, the Russell Sage Foundation Report on Comparative Costs of Public-School Education in the Several States, are something more than scientific reports. They are rather a high form of journalism, dealing with existing conditions critically, and seeking through the agency of publicity to bring about radical reforms. The work of the Bureau of Municipal Research in New York has had a similar practical purpose. To these must be added the work accomplished by the child-welfare exhibits, by the social surveys undertaken in different parts of the country, and by similar propaganda in favor of public health.
As a source of social control public opinion becomes important in societies founded on secondary relationships of which great cities are a type. In the city every social group tends to create its own milieu, and, as these conditions become fixed, the mores tend to accommodate themselves to the conditions thus created. In secondary groups and in the city, fashion tends to take the place of custom, and public opinion rather than the mores becomes the dominant force in social control.
In any attempt to understand the nature of public opinion and its relation to social control, it is important to investigate, first of all, the agencies and devices which have come into practical use in the effort to control, enlighten, and exploit it.
The first and the most important of these is the press, that is, the daily newspaper and other forms of current literature, including books classed as current.
After the newspaper, the bureaus of research which are now springing up in all the large cities are the most interesting and the most promising devices for using publicity as a means of control.
The fruits of these investigations do not reach the public directly, but are disseminated through the medium of the press, the pulpit and other sources of popular enlightenment.
In addition to these, there are the educational campaigns in the interest of better health conditions, the child-welfare exhibits, and the numerous "social advertising" devices which are now employed, sometimes upon the initiative of private societies, sometimes upon that of popular magazines or newspapers, in order to educate the public and enlist the masses of the people in the movement for the improvement of conditions of community life.
The newspaper is the great medium of communication within the city, and it is on the basis of the information which it supplies that public opinion rests. The first function which a newspaper supplies is that which was formerly performed by the village gossip.