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My keyword density for my main keyword "widgets" was 0.81% where as all my competitors were around the 2-5% mark.
I put one more instance of the word "widgets" in the meta description tag, and literally within the hour, I jumped to the 3rd position for "free widgets" and the new instance of "widgets" now shows in the search results.
I am tempted to add a few more instances of the word, but do not want to push my luck. I believe google looks for the keyword in multiple places (title, meta tag, alt tags, links, title tags etc).
If I keep my #3 position, I'll probably add 1 more instance of the word in a months time.
Maybe this is a coincidence, if it is, its a big coincidence considering I have been ranking the same for the last 4 months.
I just checked, and the latest cached version was from today right after I made the change. This might be a coincidence, but you are right, whenever you make a change on your site, google does not update your rankings right as soon as it re-crawls your site (or does it?)
None of that is the same as establishing that "keyword density" - a specific calculation - is a factor in use in the algorithm.
You wrote "one more instance of the word 'widgets' in the meta description tag". Did the keyword already appear in the meta description and you added another occurence?
And if the keyword is rare or non-existent on the page, it becomes very difficult for the page to rank on that keyword - but not impossible.
This may be true but Dell UK ranks very high on a search for the word "computers" but this word does not appear anywhere on their home page. They seem to be ranking from the weight of their inbound links containing the word computers.
I would be very sceptical about any claim that a site's rank changed within an hour of making a change to the meta description. Bear in mind that Matt Cutts has gone on record to say that the meta description is not used in ranking.
When a search result does not contain the searched for term on the page, if you click on the Cached link, you will see the explanation, up toward the top:
These terms only appear in links pointing to this page: [keyword list]
Last year for 3 months I ranked #1 for this search term, after a site design and some changes, I dropped to the 7-10 area. I had added more content, and added no more instances of the words "free" or "widgets" on the page, thus reducing my keyword density to less than 1% for these 2 words.
I have been doing SEO for over 10 years now, I make a living off of it, I study my site and competitors every day, and no matter how much I learn or think I know, google always makes adjustments.
I know for a FACT a page can rank for a word that does not exist on a page, I have a few sites like this.
Needless to say, I am now #3 on my computer at work on both FF and IE (logged in gmail and logged out). I am also #3 on my home computer, my iphone (3g connected), and the 3 friends I asked.
I made no on site changes the last month, no linkbuilding nothing, so I am left to assume that this change caused my boost.
a few days later, i dropped to the 3rd page for these 2 terms. I undid these changes and now i am going back and forth from the first page to the 3rd page for these 2 search terms daily. Half the day I seem to be on the first page, and half the day I am on the 3rd page.
I also notice, on these 2 search terms, my site doesnt have the "cached" link in google, but for all other searches I have the "cached" link.
The experement was worth it, hopefully my rankings will be restored fully. If nothing else, I have learned something new.
This is why I only make a very small amount of changes per month..in case of anything I can go back and have a better understanding of what I did.
The bounce you describe is similar to what'd happen if you acquired a few links. The bouncing around is similar to what happens when one obtain links. What is happening is you're connecting to different DC's and the DC's are showing you a different ranking calculation.
No press releases, no spike in backlink activity.
This is not a case of me connecting to different DC's. I can see it in my traffic stats.
Whats weird is when using thee query as such: [google.com...]
I come up at #3 across the board on google.com and other datacenters. However when I use: [google.com...]
I come up on the 4th page