Nielsen has for years been the subject of criticism from some of its flagship TV clients. One way to address the squabbling? Hire more TV executives. Julie DeTraglia, a veteran research executive, has joined Nielsen as head of content and strategic insights, and will oversee strategy behind editorial marketing content for the media-measurement giant, supervising  social media, insights articles, client communications, events, sales enablement tools and podcasts.  DeTraglia will be based in