Logically, the video revolution and television news should thrive together. But just as the rest of the world is alive with video information about a bullet-train crash in China or revolutions in Bahrain or Syria, America’s television screens, especially on cable news, are tuning out the world. When YouTube, Facebook, or Twitter show so much video of real life, why do ABC, CBS, NBC, MSNBC, CNN, and Fox show us so little?