Twitter will reach over 20 million US adults by the end of the year, and will grow to reach over 27 million by the end of 2013. While these numbers aren’t quite as impressive as Facebook’s, they do paint a picture of a niche social information network that is growing steadily.
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Although less than a year old, Twitter’s advertising platform – its Promoted Products suite – is expected to see massive growth in 2011. eMarketer reports that Twitter will see $150 million in ad revenue this year, which is significantly higher than the $45 million it made in 2010.
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