How does social media affect search engine marketing (SEM), search engine optimization (SEO), and pay-per-click (PPC, paid search)? Stacy Williams of Prominent Placement outlines numerous points of impact that marketers should know about, as well as providing a list of tactical takeaways that the audience can implement. Presentation given at the eMarketing Association's "The Power of eMarketing" conference in Baltimore, MD on Oct. 20 2010.