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currently i saw a lot of website using tag or related function to add in bulk keyword to their site with unrelated keyword? will it useful? why they do like this? there have tons of keywords if you click in for e.g http://www.aliexpress.com/product.html there have tons of keywords if you click in Please give some suggestion if this way useful?

Hi all, I wish to publish an article and it contain url utm parameter inside the content.  May i know google will treat it as quality backlink? i have set canonical tags on the my own site. Thanks