New York - Viacom's (NYSE: VIA) MTV Networks on Monday announced the launch of Tribes, a series of demographic-focused vertical ad networks. The first such network, MTV Generation Tribe, launched today with Pepsi as its charter advertiser, and will include publishers focused on music, movies, teen sports, gaming and style. The company will also launch Tribes from CMT, Spike and VH1 this month, while a Comedy Central Tribe is set for the first quarter of 2009. Burst Media will serve ads and recruit and manage publishers for Tribes.

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