Avoid being penalized (duplicate page penalty) because of same content+ID but different subdomains.

Dear SEO Experts,

Goal: Avoid being penalized (duplicate page penalty) because of same content+ID but different subdomains.
It's not yet posted to production yet but it will be in the next few days.

e.g. now only the IDs are different but the content is the same.

http://stcatharines.miniads.ca/200.html
http://niagarafalls.miniads.ca/201.html

After the update the 2 or more subdomains will point to the same ID.
Each subdomain corresponds to a city name.

Can I post some headers or something to avoid the duplicate page penalty ?

Any ideas ?

Is there still a duplication page penalty by the way ?
svetoslavmAsked:
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AndyBeardCommented:
The pages won't open for me but there isn't a situation where one solution fits every case.

e.g. Reuters syndicate their stories to 100s of outlets and those sites tend to rank well for their target audience, but news outlets, at least the good ones are very on the ball with SEO and do massive implementations of cross-domain canonicalization, which is one option for you.
Have the multiple listings, but use canonical tags to the original.

Another option is to have local listings based on a catchment area, but to have each listing only appear on one page which has links to nearby searches.
OLX.com does a very good job of this.

It isn't really a penaty, it is more optimizing crawl and juice allocation. By streamlining a site similar to OLX I have seen traffic gains >200%
kuzmanovicbCommented:
1. when you put canonical tag you will say that this 2 pages are the same to the google and that you prefer one over the other.
if this is the case than <link rel="canonical" href="http://niagarafalls.miniads.ca/201.html" /> in <head> will do.

2. If you want to avoid the duplicate page penalty but have this 2 pages rank / show separately than you need to make enough difference between them.
The main difference in this 2 pages is the location, Niagara Falls and St. Catharines so I would advise that you repeat it not just in title and breadcrumbs but somewhere in the h2 and body if possible just to make sure it will do the trick.

Best Regards
svetoslavmAuthor Commented:
Thank you both for the replies.

The thing is that I don't want to choose between one page and another.
All of them should be treated and indexed separately and treated equally.

The latest changes allow one ad to appear in multiple cities and/or in multiple states/provinces.

The differences will be just the breadcrumbs and some of the meta tags.

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AndyBeardCommented:
Can you really build 40,000 times as many links to index 40,000x as many pages?

If you are attempting to have every city in the US duplicating content that is effectively what you will be looking at.

If you go the canonical route you can still build links as if you have 40,000 websites, but the juice gets concentrated onto unique pages.

Trying to get them all indexed as unique whilst potentially possible is going to be a long hard uphill battle, and may result in worse results.
kuzmanovicbCommented:
"All of them should be treated and indexed separately and treated equally" - you can't use canonical tag there... You need to make enough difference between them (my answer number 2). No meta tag can help you there.

"The differences will be just the breadcrumbs and some of the meta tags" - you are informing as that you want to avoid the duplicate page penalty but don't want / can't to do anything about it..

"2. ... I would advise that you repeat it not just in title and breadcrumbs but somewhere in the h2 and body if possible just to make sure it will do the trick." - if you can't from some reason do this than there is no thing you can do more to help avoid the duplicate page penalty and index them separately and your pages are doomed to luck.

Best Regards

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svetoslavmAuthor Commented:
Hi Kuzman,

yes, I could put more H1, H2 etc. tags. that's a good idea.

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