De-duplication PPC Tagging Wikipedia 
Biznology
MARCH 25, 2013
Photo credit: Wikipedia. SEO IS ABOUT META TAGS , META DATA AND WRITING CODE: Once upon a time, the meta tag, an HTML tag that provides keyword information about a web page, was an important part of the SEO process. “There is no such thing as a duplicate content penalty” says Google in their webmaster blog.
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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