If you don't have Twitter, Facebook or LinkedIn, then Google + is another social media's popularity with SEO capabilities, so it is one more tool that a small business need to use the Google +.
Without Twitter, Facebook, Google+ or LinkedIn is another social media is popular. The ability of the SEO is the one tool that small businesses need to use Google+.
If no, Twitter Facebook or LinkedIn and Google + is another popular social media with can the SEO. It is another tool that small businesses need to use Google +.