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I did quite a bit of research and there is not one single reason you should use internal nofollow.
Anyone has the guts to de-index thin pages and see if the ranking improves? I dont.
I can think of several. To prevent a search engine from visiting form pages like for new comments or forum posts. To prevent a search engine from visiting a link that performs a certain action like pressing a like or Thank you button.
@HammerDown: Why not just use "noindex" on those pages?
What I did was repurpose content on pages that had rec'd 0-5 organic visits over the last 120 days. Absolutely zero doubt that Google placed little or no value on the content and one look at most pages left little doubt why.
Removing the bottom half of this iceberg will cause the rest to “rise up,” making more of it visible above the surface.
@HammerDown nofollow works as I want it. I have the noindex tag on my forum editor page for new posts. The problem was Google was still visiting the page for every single forum topic because the topic id gets appended to the url. Sure Google did not indexing the forum editor page but they still visit the page for every new topic. Adding nofollow for the new posts url solved this problem. This way Google doesn't waste my resources for serving the content and I don't waste theirs having them visit a page that doesn't belong in the search results.
I see no reason why not to cut content from it, its pretty useless now.
joined:Sept 25, 2017