In recent years, The New Republic, one of the nation's leading magazines of political and cultural commentary, has been embarrassed by scandals involving two of journalism's original sins: fabrication of stories and plagiarism. But the latest scandal, involving the magazine's cultural critic Lee Siegel, has to do with a transgression peculiar to the Internet age: sock puppetry. A sock puppet, in Internet parlance, is a false Internet identity created for deceptive purposes. Siegel, who had been writing a culture blog for The New Republic, had started using the pseudonym "sprezzatura" on the blog's forums to praise himself and savage his...