Twitter Picks Year's 'Most Powerful Tweets'

Twitter is celebrating the end of the year by crowning 2010’s “most powerful tweets.” What constitutes a powerful tweet? Well, here’s the list, with context in italics.

1. AnnCurry @usairforce find a way to let Doctors without Borders planes land in Haiti: http://bit.ly/8hYZOK THE most effective at this. (Reporter Ann Curry’s tweet is said to have convinced the US Air Force to give a Doctors Without Borders plane clearance to land in Haiti following the quake.)
2. Whitehouse Welcome to @twitter President Medvedev! RT @KremlinRussia_E: Hello everyone! I'm on Twitter, and this is my first tweet. (When Dmitry Medvedev joined Twitter, the White House was quick to congratulate him. Later, Obama said that "the Twitters" could replace the red phones.)
3. Leigh Fazzina I've had a serious injury and NEED Help! Can somone please call Winding Trails in Farmington, CT tell them I'm stuck bike crash in woods. (Fazzina, a triathalete, had no cell reception when she crashed in the forest, but saved her own life with this tweet.)

4. BPGlobalPR Catastrophe is a strong word, let's all agree to call it a whoopsie daisy. (See story about the BP parody site.)
5. Presidencia_Ec Gobierno declara estado de Excepción #Ecuador #30S (Ecuadorian President Rafael Correa announced a state of emergency with this tweet, amid civil unrest over a law cutting benefits for public servants.)
6. ClarenceHouse The Prince of Wales is delighted to announce the engagement of Prince William to Miss Catherine Middleton - www.princeofwales.gov.uk (Clarence House actually created its Twitter account just to announce this engagement.)

Click here for Twitter’s full list. (More Twitter stories.)