This Week's Top News Stories on YouTube--Arizona Dust storms, Bono's Unforgettable Duet, and a Squirrel's Miraculous Escape

Everyday on the CitizenTube Channel (and @CitizenTube on Twitter) we look at how the top news stories are covered on YouTube. Every week we'll post a weekly recap of the top news stories of the week:

• We watched in awe as Phoenix, Arizona, was engulfed by an epic dust storm which produced some truly spectacular videos.
• We saw saw social media history being made by Barack Obama this week with his debut tweet at the first Presidential Twitter Town Hall.
• We glimpsed the first tragic images of an unfolding humanitarian disaster in the Horn of Africa where up to 10 million people are affected by the worst drought in generations. 
• We saw Britain's News of the World newspaper closed down after scandalous revelations of phone hacking, coming from - among many others - actor Hugh Grant.
• We had a tear in our eye as U2's Bono plucked blind guitarist Andy Bevell from the crowd at a concert in Nashville and performed an unforgettable duet. 
• And finally, we cheered on a little squirrel who had a miraculous escape from the wheels of a speeding Lamborghini.