Diet Coke has surpassed Pepsi as the No. 2 most popular carbonated soft drink in the U.S. According to Fortune, the shift has nothing whatsoever to do with Pepsi's oft-reported investment in social media marketing. The entire category is down thanks to concerns about calories and the rise of bottled water as a viable alternative. So why is our friend, Bob Hoffman, using Pepsi's decline to lament the rise …
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