This week's top news stories on YouTube

To help you learn about the big stories of the week, we’re kicking off a new series from CitizenTube, a YouTube channel focusing on global news and politics.

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. Each week, starting today, we'll post a weekly recap of the top news stories of the week, as seen through the lens of both citizen-reported footage and professional news coverage.

• We witnessed widespread protests in Cairo, Egypt after the tragic deaths of over 70 people at a soccer game in Port Said.
• We monitored reports of violence in Syria, where fighting intensified causing the Arab League to suspend its monitoring mission in the country.
• We observed parts of Queensland and New South Wales being declared natural disaster zones due to flooding after days of heavy rainfall.
• We watched Eastern and Southern Europe come to a standstill due to freezing temperatures and unprecedented levels of snowfall.
• We followed the GOP candidates do battle in Florida as tensions grew on the US campaign trail, with Mitt Romney emerging as the comprehensive victor in the Sunshine state.
• We watched social networking giant Facebook announce that it was going public, as it sought to raise $5bn in the largest IPO by a technology company.
• We viewed Occupy Oakland protesters burn the Star Spangled Banner after clashes with police.
• We saw Novak Djokovic defeat Rafael Nadal to claim the Australian Open final, in a match that will go down in history as one of the greatest of all time.
• And finally, we looked forward to Super Bowl XLVI, as some companies released advanced versions of their half-time commercials.