Blizzard's juggernaut, World of Warcraft, has been declared the 'fastest selling MMO on the planet' and devs have the numbers to back up the assertion. Over 3.3 million copies of the Cataclysm expansion sold in only twenty-four hours. These numbers eclipse the former title holder, Wrath of the Lich King, by more than a half-million copies.

World of Warcraft: Cataclysm was simultaneously released in the United States, Canada, Mexico, Argentina, Chile, Europe, Russia, Southeast Asia, Australia, and New Zealand on December 7, and became available in Korea and the regions of Taiwan, Hong Kong, and Macau on December 9. More than 10,000 stores throughout the world opened their doors at midnight to welcome players who wanted to be among the first to obtain a copy of the expansion. In addition, approximately 15,000 players attended official launch events hosted by Blizzard and key retail partners in the US, Canada, France, Germany, Russia, Sweden, the Netherlands, Spain, the UK, and the region of Taiwan.

If you haven't already joined the masses playing WoW: Cataclysm, you can find out more here.