duplicate content is problem if you are trying to get ranked with itr on your site
though you wont get hurt if you get linked from duplicate content pages
the reason people spin articles is to make it look unique so it gets accepted in the article dirs, it has nothing to do with duplicate content penalization
copy scape is a best to detect duplicate content, If you need well rank in search engine with competitive keywords for long time then avoid duplicate content at your website.
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