David koretz admits he is not an adman. Yet in the same breath he says, "I can double Facebook's revenue." Koretz, who is 28, runs a tiny e-mail provider called BlueTie, in Pitts-ford, N.Y. He believes his distance from Silicon Valleys occasionally myopic thinking, and lots of experimentation, have helped him figure out a way to make millions inserting utilitarian ads into everyday software.
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