Everything Marketers Need to Know About Google's Panda Updates
Hubspot
NOVEMBER 18, 2011
Others were punished severely in the SERPs for grey and black hat tactics. January-February 2011: Google Punishes JC Penney and Overstock.com for Shady Link Practices. February, 2011: Panda Cracks Down on Content Farms. March, 2011: Google Launches +1 and Incorporates Social Sharing Into the Algorithm.
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