Now Google has confirmed there was a refresh Happening late Friday affected less than 1% of queries in the USA.
Google Tweet: FYI Panda data refresh started rolling out on Friday. Less than 1% of queries noticeably affected in the U.S. & 1% worldwide.
There was a Penguin 1.1 update on May 25th or so. So this shuffling is probably Panda related.
Previously, Google pushed out Panda 3.6 on April 27th, about 6 weeks before this update. Google tends to do Panda and even Penguin refreshes every one to two months.
For more on Panda update, see our Panda update category.
