Posts: 10,688
Name: Steven Bradley
Location: Boulder, Colorado
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The spiders are just crawling your site to check on your pages and see if they need to be re-indexed or to look for new pages on your site to add to the index.
Your site doesn't gain PR by a visit and it doesn't mean your site will show up higher in rank because the spiders crawled your site. If you're adding new pages to your site then a spider visit could result in higher PR for some pages as the new pages might be linking to other pages on your site. The new pages can now be found in search results because the search engines know about it.
It's not the spider that's raising PR or improving ranking. It's the other things you're doing on your site or the links you're gaining from other sites that will be doing one or the other. Spiders are generally a good thing though because you do want your pages indexed and if you make changes to your pages you do want search engines to know about those changes.
Any PR boost or ranking improvement might be seen after spider's visit, but it's not the spider that caused either. The spider will just have recorded things.
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