I own a e store with about 40k products, 1500 categories and news articles. My intention is to put all my products, articles and categories on blog networks. like blogger ..etc. On the blog I would replicate every item from my store with post and I would include a backlink to the item (product, category..) on my original site. I would do this to get backlinks and to drive traffic from blog networks to my site and to build brand. Unfortunetly the business is localized and even good serps could not provide unique content for blog networks. The question here is, can/will Google penalize my original website because of duplicate content? Will there be any gains in Google SEO?