Bill Keller, executive editor of the New York Times, questions the impact of Twitter and other social media on our minds. Here are a few salient excerpts: I don’t mean to be a spoilsport, and I don’t think I’m a Luddite. I edit a newspaper that has embraced new media with creative, prizewinning gusto. I get that the Web reaches and engages a vast, global audience, that it invites participation and facilitates — up to a point — newsgathering. But... Read more