As I'm writing this I have been reading through my emails and feeds on my way home and I saw from John Hood on Twitter that there had been some kind of blast in Mumbai and that people there have been updating the world through social media as to what's happening.
* update - TV news satations say this is happening in sevenlocations and some are still under siege. It's not a blast, it's seven coordinated terror attacks.
If you check, the buzz on Twitter here you'll see people using the site in such useful ways in light of this horrific incident. People are posting online so fast - about a story a second.
Photos are also appearing on Flickr from people at the scenes. Photo in this post courtesy of Flickr.