Well said. There are better "self-service" marketplaces for TV, where the media sellers have organized, but the online landscape is too fragmented. It would be

Well said. There are better "self-service" marketplaces for TV, where the media sellers have organized, but the online landscape is too fragmented. It would be inane for an agency to train someone up in "Twitter buying", so instead there are people trained in "media planning" (usually specialized in TV, Print, or Digital) who then coordinate with specialists at individual vendors (Twitter, Facebook, Google, other networks). Ad agencies add value to their clients through strategy, creative, planning, and experience in execution. The actual serving of ads is largely a pass along expense, and therefore ripe territory for smart technology companies.