This is the real intent of Google+... beyond a social network, the true semantic web. Google Communities enables topic pages beyond groups, company pages and blogs because rather than operating as standalone topic pages, they’re interconnected. Everything is indexed so you can discover, link and share topics of interest.
What does this mean for marketers? Don't simply create content, consider how that content relates to your products, your promotions, and your other content. From a social media and social business perspective, enable these connections between customers, not just between you and the customers.
Great TechCrunch writeup by Drew Olanoff this morning.