Why Wikipedia does not have duplicate content issues with search engines?
11295
What is duplicate content and how can I avoid being penalized for it on my site?
141381
Correctly indexing multiple domains with same content in Google and others
135038
Should every page in a site have a totally unique H1?
15326
Duplicate explanation should encourage improvement of original
114222
Different Google Searches return different titles for the same page
157372
Is hidden text bad for search engine ranking?
149615
Webmaster Tools, www and no-www, duplicate content and subdomains
8310
'Possible duplicate' comment not appearing for questions with deleted comments containing the link
141061
Can regularly added content improve SEO and achieve better ranking?
113164
Will a site URL with repeating keywords get penalized by search engines?
148444
Same content over multiple sites
99203
Does a unique ID and title in URL slug improve SEO?
25175
Title of the page in search results and title of google's cached version are different. Why?
2851
Is it encouraged to intentionally post duplicates for searchability?
142226
Why can we delete the duplicate link?
116941
Google search results show my title incorrectly twice
74612
How do you prevent web pages from appearing in the Google search index?