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It's the algo change, or maybe server unstability. The change of SERPs is confirm on www-ex datacenter. Check it out.
The only thing that make me happy is my competitor which is very pround of his traffic from google is now drop to page 2. LOL.
On of the most important reason of the existanse of www2 and www3 is to make sure the new index is secure/free of spam before they put it in the real datacenters a reach billions searcher.
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Everything is back to normal today, even in www-ex, so i am quite sure they are testing somew new algo yesterday, and I also think it freaks my competitor out the whole day when their site drop. LOL.