Google perhaps launched G+ to compete with Facebook. Even though it can not be called as that successful it was aiming to become at the beginning, it is a powerful tool for business owners for sure.
Google plus posts are the first to get recognized by Google search engines. It comes with great profile customization which increases your domain authority and trust. Google plus contains some of the biggest user communities in several niches.
Regular posting on Google plus, connecting your profile with GoogleMyBusiness, Youtube etc will definitely help to grow your business.