The most popular debate with content is not uniqueness any more, it is keyword density. The magic number according to most marketers is three percent, but this can be argued, when we see sites ranking well, with a page that is almost stuffed beyond belief, or just a spattering of the keyword across the page.
Of course, much depends on other factors with ranking, but if you get your keyword density right, and you will easily beat others who have similar ranking to you, with similar backlinking and other off-page SEO.
Keyword density refers to the amount of times a keyword or keyphrase is mentioned in a block of text, or on a webpage. If a page has already got the keyword on there, then this needs to be taken into consideration. If you are trying to hit the 3% – 4% mark, then you should check the whole page too. Naturally, LSI (Latent Semantic Indexing) is clearly important now, but that’s nothing to do with the actual main keyword that we’re talking about here. One could argue that there should be a great mix of LSI, and lower main keyword density, and this would still appeal to Google. This is correct. For those who have blogs that are strictly Navigation + Banners + Content on a page, then this article should help you get the density in the post just right.
A good rule of thumb is if a 300 word article is broken into three paragraphs of 100 words, then each paragraph ought to have one mention of the keyword. To help you, here are some tools:
SEO Chat Density Checker – http://www.seochat.com/seo-tools/keyword-density/
This checker is equipped with some helpful options, and is the weapon of choice for most writers.
Dave Naylor’s Keyword Density Checker – http://tools.davidnaylor.co.uk/keyworddensity/
Dave’s checker is simple and to the point. URL + Keyword is all that’s required.
For those who want to check as they go, try:
Live Keyword Analysis – http://www.live-keyword-analysis.com/
A Great little tool that will check upto 3 keywords at once.