Harry Potter and the Deathly Hallows – Part 1, based on J.K. Rowling's 2007 fantasy novel, was released worldwide.
Taylor Swift's third studio album 'Speak Now' was released. It won Billboard's 2011 Album of the Year.
All 33 miners trapped after a mining accident in Chile were rescued after being stuck underground for 69 days.
Instagram was launched and gained 25,000 users on its first day.
Actor and actress Seth Rogen and Lauren Miller got engaged.
The American biographical drama movie 'The Social Network' was released at the New York Film Festival.
Lady Gaga wore a full outfit made of meat for the MTV Video Music Awards.
The historical drama 'The King's Speech' premiered at Telluride Festival in the United States.
Singapore opened the world's first Summer Youth Olympics Games.
Californian Judge Vaughn Walker overturned the same-sex marriage ban.
Wikileaks published classified information about the war in Afghanistan.
British boyband One Direction was formed during X-Factor UK.
'Inception,' starring Leonardo DiCaprio and Joseph Gordon-Levitt, premiered in London, England.