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We have an established eCom site built out with custom php, dedicated SERPs, traffic, etc.. The question has arisen on how to extend commerce on social and we have found a solution with Shopify. In order to take advantage of this, we'd need to build out a completely new site in Shopify and would have to have the site live in order to have storefronts on Pinterest and Twitter. Aside from the obvious problem with having two databases, merchant processing, etc, does anyone know whether there are SEO implications to having two live sites with duplicate products?

Could we just disavow a Shopify store in Webmaster Tools?  Any other thoughts or suggestions?

TIA!

Some brand partners are using their short links to link back to our site (like bit.ly but they have their own). They have a high domain authority and trust so we want that link back to be read by Google. When I downloaded all inbound links from Moz, this brand's site was not listed, making me worried that the inbound link isn't being seen or considered! Haven't been able to find any info on this...