For webpages which may duplicate some or all of their content with other pages (for legitimate reasons), the canonical URL is the URL of the page which search engines should link to.

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Many user-created sites/pages and subdomains. SEO questions for primary domain

My site allows people to create free websites and provides them with a subdomain link to their site. For example, a user bsmith will end up with a site at bsmith.example.com, and pages like ...
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How duplicate must two pages be in order for one to require rel=canonical?

I've been reading up on: <link rel="canonical" href="(original url)"> And one thing that I'm trying to figure out is the lowest percent of duplication must any two pages need to be in order ...
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Multiple galleries on one page

I have multiple popup galleries that are all located in one page (homepage, to be exact). Each gallery is represented by a logo. Once the user clicks on one of the gallery logos, Javascript kicks in ...
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hreflang and no return tags with canonicals

my question is in direct response to the following question... Canonical vs HREFLANG I am in a similar situation. However we are using canonicals in each country to handle duplicated content caused ...
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Chain canonical from mobile to desktop site

I have a mobile site today with rel=canoncial to my desktop site. I was wondering if anyone knows / have a good theory how search engines handles the following scenario. mobile.example.com?sort=asc ...
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Canonical link or block in robots.txt for duplicate content across domains?

I've built a WordPress multisite for a dealership which has different franchises, ie Honda and BMW. Each franchise has its own website which have a used section, with identical content on them all for ...