"The collapse of traditional channels of communication in Haiti has again highlighted the role of social media and the internet in disasters. 
Twitter is being used as a prime channel for communications, while sites such as Ushahidi are providing maps detailing aid and damage.
Both Google and Facebook are producing missing persons lists.
Satellite networks are also diverting resources to provide communications to aid agencies and the military.
The very first images to escape from the region after Tuesday's earthquake came from citizens, capturing video with mobile phones."