To be honest we didn't really consider using Google+ We only set up a Facebook and Twitter page. Having said that, we're barely a week old, so we might revisit it down the line. From experience I've seen B2B brands not do tremendously well on Google+, could just be me though. FB/Twitter/LinkedIn are much more suited to B2B companies in my opinion, whereas Google+ can be better for B2C (again, I'm just speaking from personal experience, not making a general statement).
We've promoted our website through community sites like Quora and Reddit to great effect, I'd defenitely suggest doing that. The important thing is that you test a few different things and see what works, you'll get a quick idea what sticks and what doesn't pretty soon. Good luck
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