Search Engine Optimization (SEO) is changing at a speed never seen before and real estate agents, mortgage brokers and everyone else in the housing industry that would like to get business referrals from their websites should know what is changing and how is this going to effect their online marketing.

Large and small real estate websites and blogs have listings that are already sold or outdated. Many of them use robots.txt files to tell Google, Bing and Yahoo what to crawl and when to craw. Two day's ago Google's John Mueller made some clarification on Robots.txt file that is good to know so you don't hurt your listings' rankings in search engine by mistake.