That pervasive blurriness, the casualness about reality that results when you can turn off entire worlds simply by unsubscribing, changing a screen name, or closing your laptop, is what ups the cultural ante just now. It’s not that frauds haven’t been perpetrated before; what’s worrisome is that, maybe for the first time, the question people are raising isn’t whether the amazing story is true, but whether it matters if it’s true. Perhaps the most dismaying response to the James Frey scandal was the feeling on the part of many readers that, true or false, his book had given them the feel-good, “redemptive” experience they’d hoped for when they bought his novel — er, memoir.