A series of coordinated terrorist attacks that struck more than a dozen locations in the commercial capital, Mumbai, killing more than 170 and wounding hundreds, shocked the world and punctuated a year of growing tension and risk. Witnesses became journalists as they Twittered up to 100 messages a minute, posted photos to Flickr, and transmitted cell-phone video to television networks, all of which provided a hectic yet compelling real-time account of the horrific three-day siege in late November. The instantaneous spread of information on the assaultwhich hit two lavish hotels, a top restaurant, a rail station, a Jewish center, and a hospital, among other sitesillustrated as much as any recent event the extraordinary revolution in media and communication.