duplicate blog content across multisite

hi guys

can you help me with this please. I am creating blog posts that are to be share to child sites (setu up as subdomains) from my main multisite site.
I am creating the blogs in the main site and then using the content copier plugin to flow that content through to the child site subdomains (sometimes a blog post is flowed through to all of them sometimes a few of them).
I am now getting worried about google and duplicate content. I have read and read and got so many differing conflicting opinions. What is the situation with this for the content copier? Thanks