Marketers have an advantage in knowing the SEO algorithm consists of lines of code written by humans and runs on servers. Yet algorithms change constantly, as often as 400 times per year. This means
observations, data, and controlled experiments could become irrelevant. SEO practices built five or 10 years ago are not always valid today.
Peter Meyers runs through "fundamental assumptions"
and the evidence to support each to prove his point that what worked yesterday will likely not work today.
Read the whole story at SEOmozBlog »