Blizzard Entertainment, 2004

World of Warcraft (or WoW) is the fourth release in the Warcraft game series set in the Warcraft universe. The first one was Warcraft: Orcs and Humans which was released in 1994. Announcing the game in September 2001, the game was released on November 23, 2004: the tenth anniversary of the franchise. At this moment the world of Azeroth has an astounding ten million subscribers, peaking at twelve million in 2010, and is officially the most popular MMORPG – it even holds a Guinness World Record. Of course, a game this big has had its own episode on South Park and has its own wiki.