It's not only media control that is corporate but political control as well.
The Politics of News Media
from the book
False Hope
by Norman Solomon, 1994
The USA's major news media pose no threat to what the late writer Walter Karp called the fact of oligarchy. In the United States, he pointed out, "the fact of oligarchy is the most dreaded knowledge of all, and our news keeps that knowledge from us. By their subjugation of the press, the political powers in America have conferred on themselves the greatest of political blessings-Gyges' ring of invisibility. And they have left the American people more deeply baffled by their own country's politics than any people on earth. Our public realm lies steeped in twilight, and we call that twilight news."
Journalists are neither more nor less courageous than people in other professions; we can hardly expect corporate-paid reporters and pundits to make careers out of biting the hands that sign their paychecks. Those who pay the piper, as the saying goes, call the tune-not every note, but the overarching score-orchestration that may seem to be nowhere in particular because it is now almost everywhere, with an insistent drumbeat that after a while gets confused with the human heart. The political muzak keeps functioning as white noise, constant and familiar, with little variation, and loud enough to prevent us from hearing much of other sounds. To question the divine right of large corporations to occupy America's political throne is a lack of fealty that demands exclusion from the roundtables of mega-media discourse, where political "realities" are framed and re-framed every day.
For people on corporate payrolls, more than a little parental company discretion is advised. Mainstream journalists are cases in point:
Criticisms of government-and disparagements of the public sector overall-are far more acceptable than condemnations of corporate power. Yet the facts are cold and hard. "It is beyond doubt that the -) large corporation has always governed, most importantly by deciding whether untold numbers of people will live or die, will be injured, or will sicken," _ comments Morton Mintz, who left the Washington Post in 1988 after twenty-nine years as a reporter there; his attitude was rare in the newsroom. Media professionals are almost uniformly unwilling to voice anything that smacks of a systemic critique of the private-industry juggernaut.
http://www.thirdworldtraveler.com/Media_control_propaganda/False_Hope.html