Irvine-based Blizzard Entertainment, operator of the massively multiplayer online game "World of Warcraft," has selected Microsoft's in-game advertising subsidiary Massive fors its web sites and Battle.net online game service. According to Massive, it will be the exclusive advertising service provider to Blizzard's U.S., Canada, Europe, South Korea, and Australian online game service and Web sites. Financial terms of the ad deal were not disclosed. Battle.net is Blizzard's online game service which matches up online players on StarCraft, WarCraft, and Diablo games.