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There are many signals in the webmaster forums that show that there was a possible significant Google ranking shuffle yesterday morning and throughout yesterday. I suspect as webmasters wake up and look at their analytics it will help confirm or deny this.
There is some chatter going on at WebmasterWorld thread and then dozens and dozens of complaints in the Google Webmaster Help forums. Much more than what you'd see on a typical day.
Now, this might be Google testing a new algorithm, or testing an update to an algorithm. Or it might be a large number of individual sites received manual penalties. It can also be a bug with Google or even nothing at all. Time will tell.
I am eager to see the Mozcast report for Thursday update later today. SERP Metrics doesn't show any major shifts from the norm.
Did you notice major ranking changes yesterday in to today?
Forum discussion at WebmasterWorld & Google Webmaster Help.
