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Let's say you have a small website that has a PR of 3. On top of that you have on the domain itself a blog that is not linked to the website. The blog along with its posts are however listed in the sitemap.xml. Because they are listed in the sitemap.xml Google will index them. Do they however gain any PageRank as well?

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This is roughly the same question as webmasters.stackexchange.com/questions/4803/the-sitemap-paradox which has an answer from Google's John Mueller that says "We don't use Sitemap files for ranking." –  Stephen Ostermiller Sep 24 '13 at 19:24
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  1. Websites don't have PageRank, web pages have PageRank.

  2. XML sitemaps do not affect PageRank in anyway.

  3. If two websites are using the same domain name but do not link to each other they will not influence the PageRank of each other's pages. Domains have no influence PageRank.

  4. PageRank is only influenced by incoming links, both internal and external. So any pages in that blog or website that incoming links to them will see an increase in its PageRank. How much is determined by the PageRank of the pages that link to them as well as the number of links on those pages. The higher the PageRank of the linking page, and the lower the number of links on that page, the more PageRank is "sent" to the linked to page.

  5. Every page has a default starting PageRank (I think it is .15).

  6. PageRank is a relative scale (10 is the highest) so you can get more links that send more PageRank to your pages but still see your PageRank drop.

  7. PageRank is no longer an important ranking factor. The time it took me to write this answer is longer than PageRank is worth discussing.

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Thanks, that explained everything –  bicycle Sep 24 '13 at 18:17
    
Good answer John. Do you have any source to confirm every page has a default PageRank? –  Zistoloen Sep 24 '13 at 18:23
    
Looks like I may have confused the dampening factor with the default PR. Looks like the default PR of a page is .85 due to the .15 dampening factor. It's in the formula but this page sums it up in easier to digest words. –  John Conde Sep 24 '13 at 18:25
    
Ok thanks John. –  Zistoloen Sep 24 '13 at 18:31
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