Responsive Web Design is not limited to Publishers, site owners and Bloggers.  Advertisers and Marketers too can leverage Responsive Web Design and Publishing techniques to have more efficient campaign landing pages.  When running a campaign, a key part of the conversion process is to have a landing page that be optimized best for the user trafficking that page.  There are many platforms that offer A/B Testing techniques and those that can respond to the behavior, context or segment of that individual coming to that page at that time and that place.  This can even change based on the screen type and the context of the user at that time.