Blizzard has just sent word that the World of Warcraft expansion Cataclysm sold 4.7 million copies during its first month on sale.

"We created thousands of new quests, introduced new lands to explore and extensively revamped the game world for World of Warcraft: Cataclysm, making it our biggest and most ambitious expansion yet," said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. "We’ve been floored by the community's response so far, and we'd like to thank them for their continued passion and support for World of Warcraft, and for helping Cataclysm reach this incredible milestone."

The Cataclysm expansion was rolled out in a global launch beginning December 7th 2010.