His voice dripping with exasperation, the White House press secretary, Robert Gibbs, said to me one July afternoon in his office: “If I would have told you that I could open up a Facebook account or a Twitter account, simply post quotes, and have the White House asked about those, and to have the entire White House press corps focused on your quote of the day on Facebook — that’s Sarah Palin. She tweets one thing, and all of a sudden you’ve got a room full of people that want to know. …”