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This should answer your question: It's from an interview of Matt Cutts
Stephan Spencer:When one's articles or product info is syndicated, is it better to have the syndicated copies linked to the original article on the author's site, or is it just as good if it links to the home page of the author? Matt Cutts: I would recommend the linking to the original article on the author's site. The reason is: imagine if you have written a good article and it is so nice that you have decided to syndicate it out. Well, there is a slight chance that the syndicated article could get a few links as well, and could get some PageRank. And so, whenever Google bot or Google's crawl and indexing system see two copies of that article, a lot of the times it helps to know which one came first; which one has higher PageRank.
So if the syndicated article has a link to the original source of that article, then it is pretty much guaranteed the original home of that article will always have the higher PageRank, compared to all the syndicated copies. And that just makes it that much easier for us to do duplicate content detection and say: "You know what, this is the original article; this is the good one, so go with that."
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