I would really be interested to know how many of those computer scientists are also google employees.
I find it interesting that whenever there's a post on HN that's supportive of Google+, the community collectively reacts with extreme skepticism. Just... interesting, that's all.
I wonder if Google, having a fair number of CS researchers, might be able to get past critical mass / escape velocity / choice analogy by simply starting with its internal users and growing organically from there. You have to have something for the community to nucleate around.