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Thank you for your reply. Currently, I'm receiving good amounts of traffic to some www.domain.com/tag/blah-blah pages, will those pages be harmed if I make tags noindex?

According to SEOMoz platform, one of my wordpress websites deals with duplicate content because of the tags I use. How should I fix it? Is it loyal to remove tag links from the post pages?

They 're ads displayed by text-link-ads.com, is it negative?

Is it a good idea to start building a new link network?