De-duplication Domain PPC Wikipedia 
Biznology
MARCH 25, 2013
Photo credit: Wikipedia. DUPLICATE CONTENT GETS YOUR SITE DE-LISTED: The truth of the Google duplicate content penalty is quite simply that there is none. Duplicate content is substantive blocks of content within or across domains that either completely match other content or are appreciably similar.
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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