One Third of U.S. Online Ads Now Served By Facebook
Hubspot
MAY 4, 2011
trillion ads, 346 billion of those (31%) were on Facebook. Facebook now serves nearly one third of all online advertisements in the U.S. Basically, no other online company comes close to Facebook's market share. Facebook's dominance makes it clear that an impression isn't the metric online advertisers need to be concerned with.
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