For all we know, having duplicate contents could raise a penalty. I used to believe that as well, but after reading a post, it made more sense to call it a filter not a penalty. When you have a single page represented by two or more distinct URLs, people (especially seo newbies) say it can lead to a site penalty, but it just not. Search Engines, specifically Google, are doing their best to identify which of the duplicates can represent the others in the SERPs, so making other dupes disappear, or shall I now say filtered. And that made sense since what's the use of ranking two different URLs representing a single source in the same query? It could bring up bad user experience. In fact, Matt Cutts introduced the idea a little differently by calling it "host crowding" - http://www.mattcutts.com/blog/google...s-google-2011/ - Moreover, Google made it easy for us to tell their crawling agents we're consciously having dupe contents in our site by using rel="canonical" tag.
A penalty exist though, but only given to proven spammers. Learn the difference between a filter and a penalty.


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I am seeing even more advantage going to the owner of the original content, which is good of course, but what if you are operating an Article Directory site which is basically prone to dupe contents.

