Any adverse affect on SEO?

Hi Guys

We want to replicate a few posts, every week, across a single multisite network, so each site gets the same post in addition to their own activity which would be unique.

This plugin looks a good fit for that.

The sites would be setup as sub-domains but use domain mapping for custom url's too.

Would there be any adverse affect on our Google / SEO ranking doing this?

Thanks very much

James.