Re: google shake-up?
I have seen a number of theories but the one that seems logical to me is this:
Google reduce the ranking of large sites, take Dell for example knowing that as their traffic falls and their sales, they will instantly take up the adwords program (Cost per click where google get their money.) to get the visitors back. I say this because it only seems to be big sites that have been penalized and if it were a mistake, there would be some announcement.
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