Cathy Halligan is the former CMO of Walmart.com and current SVP of Sales and Marketing for an SF-based start-up called PowerReviews, which powers customer ratings and reviews on brands' and retailers' websites. Four Marketers Getting It Right (and Wrong) on Facebook on DEC 20, 2011 11:20 AM ET Facebook Marketing: The Four Biggest Blunders Hurting Your Brand on SEP 13, 2011 11:30 AM ET
