Why subdomains of Blogspot/WordPress like sites are treated as different domains or sites?

Posted by Thedijje on Pro Webmasters See other posts from Pro Webmasters or by Thedijje
Published on 2013-06-04T03:42:46Z Indexed on 2013/11/01 16:22 UTC
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domains

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subdomain

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multi-subdomains

As I know, maps.google.com or mail.google.com all comes under the same domain and its all are subdomain. Entire web treats these subdomain as the part of main domain and they have same Alexa rank, PageRank and all.

But in another hand, take a look on blogspot.com/wordpress.com/webs.com; these are different sites but blogs or websites under those domains are treated as different sites. Its new URL, all have different PageRank and Alexa rank as well.

Tts about millions of subdomains under those few domain, have almost similar IP address, hosting and CMS, still why they are called different domains?

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