Gangnam Style is the most viewed video on YouTube

"Gangnam Style, the dance track by South Korean pop phenomenon Psy, has become YouTube's most-watched video of all time.
It has notched up more than 808m views since it was posted in July.
The video pokes fun at the consumerism of Gangnam, an affluent suburb of the South Korean capital Seoul.
[...]
It holds the Guinness World Record for the most "liked" song ever - currently with a little under 5.4m likes on YouTube.
Previously, Justin Bieber's 2010 teenybopper hit Baby held the record for the most YouTube views.
Bieber's manager Scooter Braun was the first person in the US to tweet a link to the Gangnam Style video."

Source:  BBC News, 25th November 2012