U.S. advertising spending on cable networks will for the first time trump spending on broadcast networks this year, according to the latest forecast from media buyer ZenithOptimedia. For 2012, Zenith expects broadcast spending to drop 1 percent to $17.2 billion despite the return of the Olympics to NBC amid a projected increase in online and cable viewing for the games in London, compared with an estimated 9 percent gain to $19.6 billion for cable.
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