It solves the wrong problem, particularly with Google Circles, the Google+ feature that lets you share different things with different groups of people. And it doesn’t do anything to solve the biggest problem with social networks today: increasing the signal to noise ratio.
I could segment the content within Google+. But that requires a lot more thinking than just going to Twitter for business stuff or Facebook for personal stuff.
For people who care about the segmentation that Google+ offers, they are already doing it using different networks.
Platforms like Quora, Namesake and the disqus blog network enable me to reach wider audiences. Google+ doesn’t aggregate audiences for me around topics.
The biggest unsolved problem in social networking remains unsolved with Google+: separating signal from noise. Twitter, it seems, doesn’t even want to try. Separating signal from noise and ranking disparate pieces of content is a problem that is squarely in Google’s wheelhouse.