Google and Facebook, taken together, will account for about 63% of US digital ad revenues this year—and their share is growing.

With the duopoly taking in about two-thirds of US digital ad revenues, that leaves around a third of the market for every other firm to compete for. Most of that third is taken up by the long tail: Well over half of net US digital ad revenues at companies other than Facebook or Google go to firms outside the handful of major ad companies tracked by eMarketer.

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