I have G+, It's just like facebook, but you post content to "public" or your "circles" (friends, family, work, etc). So yes, I'd imagine that posting links as "public" would give some backlink value. I've not tested it in depth yet, but it's definitely worth giving a try - because it's new, everyone is flocking to it.
For now I see that Google Plus (button) and Google Plus (social network) are using different probably invisible metrics. Likes in social network are not visible at the buttons on the website. I am sure that using Google+ will be very important for near future, in blended results and user reviews.
What is (or will be) a big deal, is once G+ Business Pages go live. Then, us SEO guys and those who provide SMB with results driven traffic strategy will have a nice new shiny object to add to our SMM mix.
I think we have to wait for few months to exactly know how G+ will effect our business and online rankings. However there is a rumor that since we all are wishing to get ranked on the Google search engine then more association with Google and it's products will be a beneficial.
I have joined in G +, but what about the function circle .. Is not crazy! you can use any of your group and everyone can you add to it. Which circle are additional positive feature? no conformation needed !