By MARK SCOTT
Though three-quarters of its users are outside the United States, only a modest portion of its ad revenue is generated there. But it’s growing fast.
Published: November 4, 2013 at 12:00AM
from NYT Technology http://www.nytimes.com/2013/11/04/technology/Ads-Scant-for-Twitter-Outside-the-United-States.html
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