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. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Note: Totals may not add up to 100 percent, due to rounding. Alyson Hurt /NPR hide caption

itoggle caption Alyson Hurt /NPR