I have two different websites. One of them is one of the most authoritative e-commerce websites in its niche. I own forums, installation resource websites and various other sites that provide excellent user information and customer interactions.
There is another e-commerce website that I own which is very young and not as authoritative. I am about to start building it out like I did for my other site.
My question is about whether I should link my G+ profile and become a "contributor/author" to the new e-commerce site(s) or if I should have someone else in the company be the "face" of this website. Since they're in two completely different niche's, I didn't know if it will give mixed signals to Google if my G+ profile is all about niche A, and then I start throwing in rel=author and being a contributor to other sites that have nothing to do with the original niche.
Should I create another G+ profile to contribute to all of the guest posting & 2nd tier site creation for the new niche site or just use the one I have now for the time being?