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Google has been testing some pretty major algorithm changes in the last 5 or so days. Everything has been extremely volatile and major SERPs are changing every few hours.

Several prominent, white hat companies have even went missing in the Google's rankings for their [brand name] this week: https://plus.google.com/111294201325870406922/posts/NhssnKgf...

Not buying this as a long lasting rankings change until it sticks around for several weeks.

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Do you have some kind of article or source to back up your first comment? I'm interested in reading it.

Distilled, one of the more well-known and reputable SEO agencies have a good post on what they've been seeing: http://www.distilled.net/blog/seo/google-updates-april-2012/

I also work with a larger number of sites and have seen all kinds of crazy things in a number of different industries the last few weeks. Fllow SEOs at other agencies are seeing the same fluctuations.

I can confirm that this is happening. Usually I'll get a couple search terms on the first page that go up or down any given week. Most of the search terms I monitor have had lots of flux in the last few weeks.

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