Investors and financial analysis firms are increasingly looking at "sentimental analysis" — such as Facebook "likes" and Twitter messages — to gauge a company's social popularity. hide caption

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How Much Is A 'Like' On Facebook Worth For A Company's Share Price?

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A young boy works at an illegal gold mine in Dareta, Nigeria. David Gilkey/NPR hide caption

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A U.S soldier of 82nd Airborne patrols near a forward base in the Ghorak district of Kandahar southern Afghanistan. Rafiq Maqbool/AP hide caption

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Rafiq Maqbool/AP