Twitter has released its most tweeted topics and hashtags for 2011.
The lists, published in Twitter's Year in Review on its official blog, show the keywords that ''rose the fastest in the conversation''.
The unrest in the Middle East led to #egypt topping the list of most popular hashtags, followed by #tigerblood - a quote from actor Charlie Sheen.
Hosni Mubarak's resignation, the raid on Osama bin Laden and the Japanese earthquake topped the list of most popular topics on Twitter's World News list.
Top hashtags for 2011
1. #egypt
2. #tigerblood
3. #threewordstoliveby
4. #idontunderstandwhy
5. #Japan
6. #improudtosay
7. #superbowl
8. #jan25
Top World News topic for 2011
1. Hosni Mubarak's resignation
2. Raid on Osama bin Laden
3. Japanese earthquake and Fukushima nuclear disaster
4. Shooting of Gabrielle Giffords
5. Muammar Gaddafi's death
6. Swine flu outbreak
