A while back I was having some major issues with Magento duplicate content showing up in GWT.
What happens is that the big G crawls your Magento cart and classifies all of your urls that "sort" info in the backend as unique urls with duplicate content. It gets hella messy.
I never saw any negative action toward my sites due to this very common problem, but Im weird and I like everything to be all clean n pretty.
If you are using Magento you may find this useful (copy and paste the follwing into a txt file/ save as robots.txt and up to your ftp root):
# Google Image Crawler Setup
User-agent: Googlebot-Image
Disallow:
# Crawlers Setup
User-agent: *
# Directories
Disallow: /404/
Disallow: /app/
Disallow: /cgi-bin/
Disallow: /downloader/
Disallow: /errors/
Disallow: /includes/
Disallow: /js/
Disallow: /lib/
Disallow: /magento/
Disallow: /media/
Disallow: /pkginfo/
Disallow: /report/
Disallow: /scripts/
Disallow: /shell/
Disallow: /skin/
Disallow: /stats/
Disallow: /var/
# Paths (clean URLs)
Disallow: /index.php/
Disallow: /catalog/product_compare/
Disallow: /catalog/category/view/
Disallow: /catalog/product/view/
Disallow: /catalogsearch/
Disallow: /checkout/
Disallow: /control/
Disallow: /contacts/
Disallow: /customer/
Disallow: /customize/
Disallow: /newsletter/
Disallow: /poll/
Disallow: /review/
Disallow: /sendfriend/
Disallow: /tag/
Disallow: /wishlist/
Dissalow: /catalog/product/gallery/
# Files
Disallow: /cron.php
Disallow: /cron.sh
Disallow: /error_log
Disallow: /install.php
Disallow: /LICENSE.html
Disallow: /LICENSE.txt
Disallow: /LICENSE_AFL.txt
Disallow: /STATUS.txt
# Paths (no clean URLs)
Disallow: /*.js$
Disallow: /*.css$
Disallow: /*.php$
Disallow: /*?SID=
What happens is that the big G crawls your Magento cart and classifies all of your urls that "sort" info in the backend as unique urls with duplicate content. It gets hella messy.
I never saw any negative action toward my sites due to this very common problem, but Im weird and I like everything to be all clean n pretty.
If you are using Magento you may find this useful (copy and paste the follwing into a txt file/ save as robots.txt and up to your ftp root):
# Google Image Crawler Setup
User-agent: Googlebot-Image
Disallow:
# Crawlers Setup
User-agent: *
# Directories
Disallow: /404/
Disallow: /app/
Disallow: /cgi-bin/
Disallow: /downloader/
Disallow: /errors/
Disallow: /includes/
Disallow: /js/
Disallow: /lib/
Disallow: /magento/
Disallow: /media/
Disallow: /pkginfo/
Disallow: /report/
Disallow: /scripts/
Disallow: /shell/
Disallow: /skin/
Disallow: /stats/
Disallow: /var/
# Paths (clean URLs)
Disallow: /index.php/
Disallow: /catalog/product_compare/
Disallow: /catalog/category/view/
Disallow: /catalog/product/view/
Disallow: /catalogsearch/
Disallow: /checkout/
Disallow: /control/
Disallow: /contacts/
Disallow: /customer/
Disallow: /customize/
Disallow: /newsletter/
Disallow: /poll/
Disallow: /review/
Disallow: /sendfriend/
Disallow: /tag/
Disallow: /wishlist/
Dissalow: /catalog/product/gallery/
# Files
Disallow: /cron.php
Disallow: /cron.sh
Disallow: /error_log
Disallow: /install.php
Disallow: /LICENSE.html
Disallow: /LICENSE.txt
Disallow: /LICENSE_AFL.txt
Disallow: /STATUS.txt
# Paths (no clean URLs)
Disallow: /*.js$
Disallow: /*.css$
Disallow: /*.php$
Disallow: /*?SID=