http://www.eldoradoseo.com/blog/social-media-marketing/item/24-why-your-business-should-be-on-google-plus#
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Social media marketing is fast-changing, and one channel might be hot today and in decline a few months later. Keeping up may seem like too much, but businesses that ignore Google Plus do so at their own peril. In addition to its usefulness as another social media tool, having a profile on Google Plus is good for a business's SEO.
http://www.eldoradoseo.com/blog/social-media-marketing/item/24-why-your-business-should-be-on-google-plus#