Should I be worried about a duplicate content issues between LinkedIn and my blog posts?
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I sometimes take my original LinkedIn post and repost it to my blog. Since Google indexes LinkedIn posts, is there any need to worry about duplicate content issues? Or will Google recognize the common author/ownership?
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It's not a good idea to repost content from one source to another, unless you have Canonical settings applied so Google understands which page is the true authority/source for the content.
Without those canonical settings applied, you are running the risk of it being seen as duplicate content.
I suggest using Linkedin as a gateway to your own website - post unique content on both sites. One idea could be posting an introduction of your blog post on Linkedin and then expanding upon the theme in greater detail on your own blog.
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I certainly don't want to see self-promotional, but I actually published a Moz essay yesterday that deals with exactly that: How to Approach Owned and Earned Media. In the section entitled "How to Combined Owned and Earned Media," you'll see a step-by-step guide to maximizing the benefits of LinkedIn and your own blog.
If you have any questions, feel free to comment either there or here!

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Thank you both for your insights. Samuel - Great article on owned and earned media! Thanks for sharing!