Twitter Is Selling Access to Your Tweets for Millions

Twitter's quickly growing (but still unprofitable) advertising business has gained lots of attention recently as the company prepares for an initial public offering. But selling promoted tweets is not the only way the social network generates revenue. Firms interested in gauging consumer sentiment about everything from computers to pop stars are shelling out millions of dollars to harvest and analyze the collective opinions of the Twitterverse. In the first half of 2013, Twitter generated $32 mi...