Curt Viebranz, the CEO of AOL's ad sales unit Platform A, is leaving. AOL did not say why, but "sources" are suddenly tipping off a lot of blogs that he was fired. Viebranz, former head of Tacoda, joined Platform A at its inception last fall. The unit was supposed to house ad sales for all AOL units. Another AOL executive, Advertising.com president Linda Clarizio, will replace him. Advertising.com execs strongly opposed the Tacoda acquisition, saying Tacoda's technology was overrated. Guess who just won that argument?

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