There exist a few gargantuan time-wasting and mind-numbing web sites that scoop up hours of attention like a whale does krill. Facebook, with its coterie of applications (like Farmville and Mafia Wars, though I fear my lack of experience here is showing), is the undisputed king, but Twitter also looms large. The carcasses of others, like MySpace or Friendster, twist far off in their wake, drifting slowly down on gentle currents that carry them deeper into obscurity. Others, like LinkedIn and... [More]