Facebook has added a Facebook subscribe button that allows you to get the feed of anyone you want, without the ‘friend’ attribution. (Don’t Google+ Circles allow that already? Of course.)
Internet Marketing is about having a roadsign on every path that your clients and readers may cross, not just the sign on big dog Google. So you’re probably already working Facebook, Twitter and LinkedIn, and maybe YouTube.
I’m going to emphatically recommend that you get on Google+.
Wondering if you want to go all out and develop yet another social media presence when the first two or three may be taking up too much of your time? My experience has been that Google+ is interesting in and of itself; more engaging than Facebook, and perhaps more satisfying than Twitter in that there is a great ease in seeing comments and +1s to your content.