From The Guardian:
From the moment the first shots were fired, the internet provided a kaleidoscopic view of events in Mumbai. Using blogs and file-sharing sites, those caught up in the mayhem rapidly provided accounts from the ground as well as links to the best news reports appearing on the web.
One rich source of information was Twitter, which provides text-message-length updates. Its Mumbai thread provided a stream of snippets, not all accurate, from observers on the ground, with details of casualties, sieges, gunfights, and even the suspected names of terrorists.
In many cases, Twitter updated developments faster than many TV networks or newspaper websites. The site's contributors also questioned the veracity of some news reports, pointing out contradictions and errors. When Indian reporters announced that the siege at the Taj hotel was over, for example, Twitter contended that gunfights were continuing.