First thought that comes to mind. Try making use of therel=author attribute. For example: a WP blog allows for authorship as well as sites like BloggerSpot and ArticlesBase.com. From experience it would seem that when sites are joined or for a better term utilized as assets to help the later of the sites, duplicate content does not pose to be a problem when you have the capability to claim the content.
Because of the push for rel=authorship, making sure you are claiming your content no matter what site it is placed on is very important. Because of this, there has been discussion on how helpful articles directories are now a day’s.
Another thought on this as well revolves around the rel=me attribute. If you will look at the example provided by Google. Website’s allow for separate author page profiles that directly link to the article and the article directly links back to the author page profile. This cohesive linking allows for Google to determine you are the author of the content.
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