World of Warcraft. Massively multiplayer online role- playing game, Blizzard Entertainment, Warcraft (series), Warcraft III: The Frozen Throne, World of Warcraft: The Burning Crusade, World of Warcraft: Wrath of the Lich King, World of Warcraft: Cataclysm, BlizzCon, Gameplay of World of Warcraft, Corrupted Blood incident, Virtual economy, World of Warcraft: The Board Game, Social interaction in MMORPGs