A Buyer's Guide to SEO Firms

Marketing Sherpa has released the 4th edition of its Buyer's Guide to SEO companies, profiling more than 120 firms that do organic search optimization for clients. Though the Guide is aimed primarily at buyers of SEO services, it will also interest practicing professionals, providing insights into common practices used (or not used) by some of the major players in the industry. See today's SearchDay article, Choosing a Search Engine Optimization Firm for a complete review.