Twitter's projected ad revenues this year of $139.5 million will be more than triple its result for 2010 on the road to $400 million in 2013, estimates eMarketer. "Marketers have shown solid engagement rates with Twitter advertising ... despite Twitter's relatively smaller audience," said eMarketer principal analyst Debra Aho Williamson, who noted that Twitter is pursuing the same self-serve advertisers that use Google and Facebook.

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