Google Panda Update Number 22

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Panda update number 22 (Image credit:- searchenginefreak)

Google
has confirmed Panda update number 22 on November 21st, 2012. Panda is the popular algorithm to combat web spam.
This is the second time Panda refresh happened on November. Recently Google had
updated the Panda algorithm on November 5th, 2012. 
Impact

This update has affected 0.8% queries
worldwide. There are mixed reactions from the webmasters community with some webmasters complaining of a recent drop in theirn rankings.

More information can be found here

How to remain safe?

Add original and fresh content to your site. Create unique topic pages to benefit the users and avoid creating doorway pages or pages created specifically for the search engines.

More references:- 


Also See:- 

Google Panda Update Number 20
Google Panda 3.9.1
New Google Search Quality Updates
EMD Update
Google Penguin Update
Google Human Quality Raters Do Not Influence a Website Rankings Directly