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I've got a Tumblr blog for my main site, I use it more as a proper blog with articles and images, rather than just a tumblog.

The blog is mapped to blog.mydomain.com.

Becuase of the ease of social reposting in Tumblr people often repost my articles (which is great - backlinks!) But all these links go back to my blog and not my main site which is a mydomain.com does Google see blog.mydomain and mydomain as the same / linked item and is my main site getting the benefit of these links?

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up vote 2 down vote accepted

A sub domain is treated as a different entity. If you're linking from say your blog to your root domain you will see a benefit with the more trust value you build up to your blog.

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