What belief does postman hold about television?

He believes society is affected by the biases of TV.

Explanation:

Postman believes that society has been greatly affected by the importance we give to TV entertainment in our life. He believes that our society resembles that of Brave New World, in which citizens of a dystopian society medicate themselves in order to be always happy. In this case, although there is no medication, we stare at TVs all day in order to be perpetually entertained. This addiction to amusement means that we only pay attention to ideas that are easy to digest, communicated in a visually-appealing way and that entertain us. However, we care very little about the content and the information we are receiving. These biases of TV, and the importance we give to form over content, have greatly affected our society.

answer: we need to see the ads : )