Rolled out 4 October 2013. Penguin 2.1 was a data refresh of the Penguin 2.0 link spam algorithm that Matt Cutts said noticeably affected about 1% of searches, followed by a year-long wait.
Bought an expired domain and lost traffic? Here is how to check whether Google’s expired domain abuse policy applies and how to rebuild the site honestly.
A drop can come from a human-issued manual action or an automated algorithmic change. Here is how to tell which you have and why the fix differs.
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