Books De-duplication Wikipedia Youtube 
Biznology
MAY 7, 2012
Panda (Photo credit: Wikipedia). And duplicate content is ever more problematic. You build the page and embed SEO-enhanced YouTube videos into it. Especially in large corporate settings, the main culprit to SEO failure is duplicate content. Find and retire old, duplicate content. So why is your page not ranking?
Moz
JULY 17, 2019
For two years, Google honed and changed their messaging about Mobile-First Indexing, mostly de-emphasizing the risk that good, well-optimized, Responsive-Design sites would face. Before Fraggles and Fraggle-Based Indexing, indexing # URLs would have just resulted in a massive duplicate content problem and extra work indexing for Google.
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