Reader comments posted on digital news sites are often heavy on invective, hurled from noms d’Internet that allow people to disregard traditional norms of civil discourse. For many of these anonymous snipers, the reported facts are not facts at all, but the unreliable product of paid liars, incompetents, toadies, and haters who dare to call themselves journalists.

How did we get to this pass? A turning point may have been the messy exit of Jayson Blair, who was shot down by journalists themselves and subsequently became a stinking albatross around the neck of everyone in what used to be called straight news. Many Americans, adrift on a stormy sea of proliferating news outlets, now perceive bias, bias everywhere, but not an honest word of reportage.

Meanwhile, a small industry, of remarkably uneven quality, has arisen over the last few decades to examine the supposed unreliability of journalists. The bias police range from ideological outfits like Fairness and Accuracy in Reporting on the left and the Media Research Center on the right to such watchdogs as Keith Olbermann and Bill O’Reilly—not to mention the ombudsmen who now keep an eye on many big-city newspapers (and this magazine).

But while the pack zigs, Farhad Manjoo, until recently the technology columnist for Salon, zags. His first book, True Enough, is a provocative and engaging examination of media bias. Like beauty, argues the author, bias is in the eye of the beholder. So instead of looking at those who report and analyze the news, Manjoo examines their audience. It is a novel and eye-opening approach.

Manjoo argues that “selective perception” is part of the human condition, and that in this era of unlimited news outlets, it is surprisingly easy to get all of your news from places that tell you only what...

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