When I joined facebook, you had to use your university email address. There was zero expectation of not being linked to your identity. Perhaps Facebook broadened after that, but the Facebook culture was already established that you expect to see real people you know there.
Google instead tried to shoehorn existing users with a different culture. Perhaps they could have created a separate service with different expecteations and grown that, but they seemed to feel entitled to a create a short cut to success at their user's expense.
Yep, I think you hit the nail on the head here. Facebook began with an expectation around an account tied to a real-life identity, and Google didn't. Google totally mis-read the cultural implications of integrating G+ into existing Google products.
Google instead tried to shoehorn existing users with a different culture. Perhaps they could have created a separate service with different expecteations and grown that, but they seemed to feel entitled to a create a short cut to success at their user's expense.