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Twitter Global Expansion Increases Sales, Censorship Challenges

Twitter Inc.’s international expansion may help fuel a threefold gain in revenue, even as it raises censorship challenges for the microblogging service.

Ad revenue at Twitter is set to rise to $540 million in 2014 from $139.5 million in 2011, according to New York-based research firm EMarketer Inc. Increasing popularity overseas will decrease the site’s reliance on U.S. advertisers. The percentage of dollars coming from the U.S. will fall to 83 percent in 2014 from about 90 percent this year, EMarketer said.