Say you are the owner of
example.com with a wiki at
www.example.com/wiki Say
you decide to move the wiki to it's own subdomain:
wiki.example.com/wiki.
Would there necessarily be any "hit" on SEO assuming you implement
permanent redirects at the www site?
Yes, there would be. That article still has validity. The basic issue
is that if you have built up "momentum" and a bit of a reputation with
Google, meaning DA or PA or other weighting factors, then when you (A)
remove content from
example.com you are asking for them to lower your
ratings because now that domain has less information and (B) you are
starting off essentially at zero rating for
wiki.example.com, meaning
you are starting off almost from scratch.
The search engines consider
example.com and
wiki.example.com as
related, but essentially separate entities, which while not always
what we want, is essentially valid and correct as for other sites,
these are indeed somewhat independent entities.
Hope that helps.
Hershel
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