But technology is also turning us into a global water-cooler culture, with millions of people sending each other (via e-mail, text messages, tweets, YouTube links) gossip, rumors and the sort of amusing-entertaining-weird anecdotes and photographs they might once have shared with pals over a coffee break. And in an effort to collect valuable eyeballs and clicks, media outlets are increasingly pandering to that impulse — often at the expense of hard news. “I have the theory that news is now driven not by editors who know anything,” the comedian and commentator Bill Maher recently observed. “I think it’s driven by people who are” slacking off at work and “surfing the Internet.” He added, “It’s like a country run by ‘America’s Funniest Home Videos.’ ”

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AT THE SAME time the Internet’s nurturing of niche cultures is contributing to what Cass Sunstein calls “cyberbalkanization.” Individuals can design feeds and alerts from their favorite Web sites so that they get only the news they want, and with more and more opinion sites and specialized sites, it becomes easier and easier, as Mr. Sunstein observes in his 2009 book “Going to Extremes,” for people “to avoid general-interest newspapers and magazines and to make choices that reflect their own predispositions.

I'm thinking whether I'm guilty of this kind of behavior...