Google may just have the right idea, which could well mean that they may outlive Facebook. By keeping personal and business operations separate, they avoid the trap that could make the personal aspect of Google Plus unusable because of the marketers abusing it.
Chris, Facebook has the same thing. You create business pages there just like Google+ (FB was first with this I'm quite sure).
I've heard numerous online marketers over the years swear that they get the biggest bang for their buck via Facebook, no question. If they could only keep one form of marketing, they generally say it would be Facebook.
So take that for what you will. I'm sure it depends on the type and size of your business and how you use Facebook, but I know with 100% certainty that it makes many, many businesses some great money and brand loyalty.