Should we be using robots.txt to block content we don't want crawled or using nofollow tags for internal links? The official definition, as defined by Google, for nofollow are links that you don't vouch for. Using nofollow for internal links would be sending Google the message that you don't vouch for pages on your own domain, which could lead to a problem if a future search algorithmic change took that into consideration.

So wouldn't it be better to just robots.txt to block these, and no have nofollow applied to internal linkings?

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I'd use the robots.txt file to block pages from getting indexed in google

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