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Google updates its index data, including backlinks and PageRank, continually and continuously. We only export new backlinks, PageRank, or directory data every three months or so though. (We started doing that last year when too many SEOs were suffering from “B.O.”, short for backlink obsession.) When new backlinks/PageRank appear, we've already factored that into our rankings quite a while ago. So new backlinks/PageRank are fun to see, but it's not an update; it's just already-factored-in data being exported visibly for the first time in a while.
Google also crawls and updates its index every day, so different or more index data usually isn't an update either. The term “everflux” is often used to describe the constant state of low-level changes as we crawl the web and rankings consequently change to a minor degree. That's normal, and that's not an update.
Usually, what registers with an update to the webmaster community is when we update an algorithm (or its data), change our scoring algorithms, or switch over to a new piece of infrastructure.
-- Taken from Matt Cutts Blog.
Google updates that took place on last year October was named as Jagger Updates.
To protect the interests of visitors or customers or end users google had several issues against which it could fight.
Like CSS spamming, blog spamming, link spamming are most popular bad seo tricks for google to deal with.
And in the Jagger update what we believe that google had handeled few factors like Content relevancy, Backlink relevancy, css spam filtering to wipe out bad seo. Google will continue to fight spam to protect their words or their business ethics like Informational Relevancy, Gaining Market Share , Revenue Generation , Community Responsibility.
Jagger is one of the approach to keep the words in track.
Gilchrist: for all practical intents and purposes, the three phases of Jagger are almost obsolete.
In late December/early January, Matt announced on his blog that the "BigDaddy" update was taking place across the Google datacenters. This is a combination algorithm/infrastructure/who knows what else update that has been slowly rolled out through the datacenters over the past few months.
All of which really means nothing other than that "Google shook things up again, now go figure out what the hell they just did."
One thing though...if you're spamming, Matt's been using his blog to fire off some pretty fair warning shots. Personally, I smell something big, controversial, and twisted in the works. _________________ HEDir's Prince of Cool
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