The US military has begun airdropping food and water supplies into earthquake-hit Haiti.
“Our plan worked exactly like it was supposed to,” says Wendy Harman, social media manager, at the American Red Cross.
“We have a ‘cabinet' of 30 celebrities, who have agreed to ask their Twitter followers to spread the word.
“Within three hours of the earthquake, we had our text number ready.
“We tweeted. The celebrities re-tweeted. And then others quickly followed. People like Michelle Obama, Jane Seymour and Craig Newmark (of Craigslist) got on board. And after that, the appeal spread like wildfire.”