People who have following Google's algorithm call the newest update for Panda algorithm as Panda 4.1. Even though as soon as this change happened, Google said that they have made few improvement to Panda algorithm 4.0, and also other unnamed algorithms. Google told their users not to jump the gun of any changes in search engine rank is because of one of the algorithm that they changed. But they decided to explain that web page rank on their own search engine is a complex and continuously endeavor.
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