The social media herd can turn on a dime, praising a company one month and then trashing its reputation the next (see Papa John’s, below).  The past year has seen many such ups and downs, and this article looks at a few of those the herd ranked highest. In 2011 Thomson Reuters partnered with behavioral economics consultancy MarketPsych to bring psychological analytics into the investment arena.  MarketPsych’s patented natural language processing engine quantifies emotions and themes expressed in relation to a universe of over 12,000 global companies, 45 currencies, 187 countries, and 36 commodities.  The software scans articles and posts