• http://www.seo-theory.com/wordpress/ Michael Martinez

    It seemed a very reasonable estimate to me. When I compare my search referral queries to old data I see a tremendous shift in topic over time. A lot of that traffic still goes to the same sections, but people are using different queries to find the older content.

    New content, of course, still focuses on what is current and interesting. But I think the 20-25% shift per month is about right and many large site Webmasters who analyze their referral data on a regular basis would probably agree there are shifts in query trends.