Graham Majin in Quillette:
McLuhan’s impact on journalism was significant. His message was that all the techniques and values of Victorian liberal journalism should be discarded. The old-fashioned search for truth, using the tools of balance, objectivity, and impartiality, no longer applied. Although greeted with indifference or derision by older journalists, McLuhan’s insight was a Damascene moment for many young writers. As one underground journalist explained in 1966:
One year ago, in the first issue of The Paper, I discussed the loyalty I felt I had to the traditional ideals of journalism. … In the year since we began publishing, a very significant evolution has taken place in and around the American press.
The writer adds that he attributes “a great deal of importance to McLuhan” who had been his guide on a journey of transformation and enabled him to abandon the old journalism: “[W]e really didn’t have the slightest idea what we were getting into last year, when we thought we cared mainly about journalistic ideals.” Having abandoned impartiality, the writer describes how he embraced “the tendency to enlightened and interpretative subjectivity.”
More here.