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Erm, ... this is a damn old technique like keyword stuffed alt text or any other short term stuff.
FWIW i just want to throw my comment on subdomains before the complains get too wild - don't want to let some bad light shine onto the good old canonicals: using subdomains (canonicals) is a commonly used set up - since ages. It's perfectly legit in many cases. What you see is *somebody* uses subdomains to get double listings. Double listings have always been penalized / removed by google's algo - me, i have no doubt that you will see the same happen to the mentioned examples.
Just please don't complain about subdomains in general, ok!?
IMHO, the title of this thread would be better named:
Abuse of Subdomains
Does manipulative use of canonicals help?
I really hope the spamming usage of this will not become a problem, as if it does, then my usage will like as not be caught within the same filters, and penalised. If google were to penalise this they should only do so after a hand review.
- city.keyword.com is ONE domain / website
- keyword.com/city is ANOTHER domain / website
Google dosn't group across different domains - therefor only a duplicate filter can spot this. And if it's a intentional duplicate, it's abuse. ;)
<added>
Hehehehe, nice related discussion about subdomains going on right now at this thread: Could google be penalising me for having too many sites? [webmasterworld.com]. Let's talk about abuse of canonical's. ;)
</added>
Gus, do you mean you found
#1 domain.com/page.html
#2 domain.com/page.html
#3 domain.com/page.html
....
# 999 domain.com/page.html
#1000 domain.com/page.html
...?
Impossible imho. At least i never saw such.
>same ip, same domain.
... and obvisously no subdomain issue.
Or did i miss your point?