Why is feedback in mass communication said to be delayed?

First, feedback in this context does not refer to a loud and distorted sound coming out of your speakers. This kind of feedback refers to a response or a reaction from the audience. In mass communication, feedback is delayed because there is no way for the speaker or performer or author to know what every member of the audience is thinking or feeling. For example, I just wrote a new book. (Books are an example of Mass Communication.) I hope you will read it, but when you do, how will I know whether you like it or not? Even if you send me an e-mail, there is a delay between when you got the book, when you read it, and when you sent the e-mail.

Or, let's say I just watched my favorite program on TV. I want to tell the lead actress that I think her performance was amazing. However, there will be delay from the time I send the message to when she receives it (assuming she receives it at all). SO, one characteristic of mass communication is that when the message is sent out via radio or TV or a magazine or the internet or some other mass medium, there is a gap between when the public reacts to it and when they are able to respond. That is why feedback is said to be "delayed."