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Gabriella Sannino
How Google May Identify When Sites Transform into Doorway Pages - http://www.seobythesea.com/2011...
You go to a site that you’ve enjoyed and bookmarked sometime in the past but haven’t visited in a while, and it’s changed. The topics it discusses are different, or the writing style isn’t quite the same, or it suddenly has links within its content to commercial pages that it probably wouldn’t have linked [...] - Gabriella Sannino