Best Industries 2012: Internet Publishing | 5 Powerhouse Start-ups to Watch

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Practically overnight, Pinterest saw the kind of hockey-stick growth most start-ups can only dream about. The "virtual pinboard" racked up 10 million monthly users—mostly teens and women—in February, according to comScore. While some sources suggest that Pinterest's user figures may be leveling off, it hasn't stopped rumors that the start-up is the next big acquisition target. Meanwhile, the company has just raised $100 million in funding, putting it at a $1.5 billion valuation. Its reportedly venturing into the e-commerce space in the near future.

Read more about the Internet publishing industry.

--Judith Ohikuare