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If you work on large websites, grab some coffee and work your way through +Maile Ohye's recommendations for faceted navigation in our blog post.

It's a long post, but there's a lot of really important information in there. Take the time to understand the details!
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How many pages does a site need before it is considered  a large site? Over 1,000. 10,000?
thanks +John Mueller I read that blog post you linked to earlier, a  few angry people in there giving you some stick :(

Most of the pages on my site are effectively breadcrumbs themselves
The end page (business listing) is linked to from numerous start ways -
Category, County, Town, Category in County, Category in Town would they still be classed as breadcrumb links if they are not actually links direct to the final destination?

Take this page as an example
The page itself is effectively the middle of a breadcrumb,
linked to from All categories then going to a particular category, which eventually goes to the end page.

Would it be correct to mark up the links on as breadcrumb links?
I'm a bit late to the party :)

Regarding the article, I'm a bit confused on the rel="nofollow" recommendation. +Matt Cutts has long suggested to avoid using nofollow on internal links (I assume for reasons I mention at the end).

Also, the wording is a bit odd. +Maile Ohye says this option "minimizes the crawler’s discovery" yet she goes on to say it " doesn’t prevent the unnecessary URLs from being crawled". What's its purpose then? Just removing the pages from the index?

It makes little sense you should use it for that since you can always opt for using "noindex" or, even better (and as Maile suggests), using "canonical" to consolidate indexing signals.

With "canonical" in place there's no use for "nofollow". In fact, using "nofollow" together with "canonical" could actually work against you since there's no link equity flowing through those links, thus no equity to be consolidated by the "canonical" tag (since link equity is not being redistributed from nofollowed to followed links, it dissipates instead ).

This is why I think the recommendation should be to use the "canonical" tag, not the "nofollow" tag.

Feel free to egg me if I'm wrong :)
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