Yes, this is duplicate content. Duplicate content covers the whole web - not just your site. Squidoo for example will not post your article as they will see that it is somewhere else on the web.
Best posts made by brightonseorob
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RE: Article Re-posting / Duplicationposted in White Hat / Black Hat SEO
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RE: Will Facebook traffic hurt our SEO? Should we put our blog on the core domain or sub domain?posted in Social Media
I agree with Matt, he's got some great points there. In terms of the Facebook traffic, this will not have any effect on your SEO. When Google is looking at site engagement, it's in terms of Return To SERPs. So, if someone performs a search, visit your site, returns to Google and visits a competitors website, then that's bad. Referral traffic is a different matter. However, I totally agree with Matt here. You are missing a trick if visitors from Facebook are not engaging with your site. I would look into why this is and try to provide some reason for them to engage. Why not ask your followers what it is they are looking for when visiting your site?