1. Death of Osama bin Laden
2. Packers win the Super Bowl
3. Casey Anthony found not guilty
4. Charlie Sheen
5. Death of Steve Jobs
6. The Royal Wedding
7. Death of Amy Winehouse
8. Call of Duty: Modern Warfare 3
9. Military operations begin in Libya
10. Hurricane Irene
1. #egypt The Revolution in Egypt.
2. #tigerblood Charlie Sheen has alleged he's got tiger blood.
3. #threewordstoliveby Three words to live by…
4. #idontunderstandwhy I don't understand why…
5. #japan The Tsunami in Japan & Fukushima.
6. #improudtosay I'm proud to say that…
7. #superbowl The most important sports event in the USA.
8. #jan25 Protests Against Mubarak
I should spend more time in Twitter: have no idea whatsoever what half of its most popular topics are about.