The Wall Street Journal profiles the working habits and aspirations of one of Silicon Valley's most-watched men in Thursday's paper: 25-year-old Facebook founder Mark Zuckerberg. One of the games he likes to play is to imagine what he would do if he had $1 trillion dollars to work with. He says he is in no hurry to turn his social networking behemoth into a public company. Don’t expect much praise, if you work for him. But do expect movie quotes: Zuckerberg is particularly fond of Troy, which he screened for employees once. He even delivered a gong to the office so workers could announce new developments with added authority.