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2 - How useful is Keyword Density?
Keyword density was once the single most important criteria for judging the value of a webpage. I'm talking back in the pre-Google era (now if THAT doesn't give you a hint about how outdated keyword density is...). However, with Google's PageRank algorithm and the general trend towards off-page factors determining more and more of your website's rankings - the importance of keyword density as an on-page optimization tool diminished. People continued to theorize about what the ideal keyword density should be, and estimates ranged from 2% to 8%. Keyword density, in case you are wondering, is measured by the following formula:
Keyword Density Formula
d = x / y where:
x = No. of times a keyword is used in a block of content (page)
y = total word count of the page
d = keyword density
The problem with keyword density is quite simple - it is very, very easy to manipulate and spam. Spammers used automated content generators to create highly optimized web pages with high keyword densities. As search engines started to set limits on "acceptable" keyword density, spammers got smarter and smarter and reduced their keyword density as well, making it especially hard for search engines to separate spam content from genuine, useful content.
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