This Week's Top News Stories on YouTube-- Dramatic rescue in Italy, protests in Tunisia, and uneasy truce forms in Zabadani, Syria

Everyday on the CitizenTube Channel (and @CitizenTube on Twitter), along with our curation partners @storyful, 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 witnessed dramatic rescue efforts as the cruise ship Costa Concordia crashed into rocks in shallow waters in Giglio, Italy.
• We watched the CEO of the Costa company blame human error, as most accused the ship's captain, Francesco Schettino, of being at fault for the crash.
• We monitored events in Syria where military forces attacking rebels in Zabadani agreed to a ceasefire, as Obama raised concerns about the violence there.
• We saw unprecedented amounts of snow falling in the state of Washington, with many going out and making the most of the rare event.
• We followed the GOP candidates during a dramatic week on the US campaign trail, as Jon Huntsman and Rick Perry both dropped out of the running for the Republican nomination.
• We marked the anniversary of the 'Arab Spring' with protests in Tunisia at the slow pace of reforms.
• We witnessed Russian oil supply ship Renda arriving in Nome, Alaska with assistance from the US Coastguard.
• We viewed the forced closure of Kruger National Park in South Africa due to prevalent flooding caused by heavy rain. 
• And finally, we celebrated with Muhammad Ali, one of the most iconic figures alive, who turned 70 this week.