incrediBILL - 7:09 pm on Feb 8, 2013 (gmt 0)
I have been in SEO since 1990 and there have been many changes
You mean like the creation of search engines in 1993?
... or the first use of the term SEO in 1997?
According to industry analyst Danny Sullivan, the phrase "search engine optimization" probably came into use in 1997. The first documented use of the term Search Engine Optimization was John Audette and his company Multimedia Marketing Group as documented by a web page from the MMG site from August, 1997
I'm assuming that 1990 was a typo?