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Since the recent shift in GEO targeting our .com is no longer ranking on the Google.ca as it used to. We have a geo ip redirect on the .com so that if the user is from Canada they get redirected to the .ca site, if in US they get the .com.
Currently we are banning the engines from crawling and indexing the .ca version and I'm wondering if we should open this up to Google (and other engines) and if we did is there a possible dup content penality.
Thanks for your feedback.
Google may penalize both of your sites for this duplicate issue however usually google will pick the original site and apply the rankings to it. I've seen both cases, neither of which will give you the results you are trying to achieve. If you are going to keep both sites identical you are running this rick.
Linking a .ca to a .com with same content
It's definitely good advice to try to differentiate the sites as much as possible with localized content.
For other discussions on these issues, take a look at the Geo-Targeted Search threads referenced in the Hot Topics area [webmasterworld.com], which is always pinned to the top of this forum's index page.
Right now we've got a complete ban for all engines on the .ca - the site's massive and making the copy unique would be a massive undertaking.
We could host the .ca version in Canada - but again, I don't think that'll help with the duplicate content issue.