According to the “Social Media Survey,” an online poll of 271 US CMO’s, VPs of marketing and marketing directors conducted byPRWeek and communications agency MS&L this June, almost 70% of marketers say they have never made a change to their products or marketing campaigns based on consumer feedback on social media sites. 43% said lack of knowledge and expertise prevents them from using social media in their marketing programs, and 39% said they are not convinced of its value or ROI.  Summary at BtoB.