Google is rolling out the Panda algorithm update 3.9 on July 25, 2012.
This update will affect nearly 1% of search results according to Google.
Panda is one of the search algorithm update, out of 500, which Google has been updating throughout the year 2012.
This new was broke on Twitter by a Google Official.
New data refresh of Panda starts rolling out tonight. ~1% of search results change enough to notice. More context: goo.gl/huekf
— A Googler (@google) July 24, 2012
The last Google Panda update 3.8 was on June 25, 2012, exactly a month ago. Panda algorithm update was introduced in Feb 2011 to increase the user experience by filtering low quality or thin content from Google search results.
To know more about Panda updates, checkout our articles Google Panda Updates – First One Year [ INFOGRAPHIC ] and Google Penguin Update Vs. Panda.