After the Haiti earthquake the international relief agency "Doctors Sans Borders" went to the country with aid and was not allowed to land. Ann Curry Tweeted the following message at usairforce:
"AnnCurry Ann Curry @usairforce find a way to let Doctors without Borders planes land in Haiti: http://bit.ly/8hYZOK THE most effective at this."
Doctors Sans Borders was allowed to land. Have a look at the 10 Most powerful Tweets here. Link Courtesy Zigzackly.