Can one use Google+ for marketing purposes?

Google+ comes with a unique and useful tool called ‘Hangouts’. Hangouts help the owner or worker business firm to have video conversations with its customer at zero cost. If the firm regularly shares their contents on Google+, it gets indexed very fast and therefore, it becomes easy for one to rank their website by using target keywords. It is also stated that one should always integrate their Google+ page with other platforms like Facebook, LinkedIn, Twitter YouTube, and also the company’s website if any.