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Yes they do. Actually some SEs have developed content duplicate filter, and they know what's the source of the content, no matter on how many other sites it is posted....But google, as I know, unfortunately doesn't have that mechanisam developed well so far, and it can penalize sites with dupe content. So I would be careful with it.
I am sure (based on some article, and on my own experience) that MSN has the best dupe content filter. If the orginal content is on siteA.com , but posted on siteB.com and siteC.com, when you search for that content on MSN, it'll show siteA.com as its source, the original source of the content.
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