"Proven" was hyperbole, sorry. I think the difference is significant: Facebook was a place for Harvard students to communicate with other Harvard students. That

"Proven" was hyperbole, sorry. I think the difference is significant: Facebook was a place for Harvard students to communicate with other Harvard students. That is useful. Google+ was a place where you could communicate with a random subset of your friends and acquaintances. That's mostly useless. For one-to-one communication it's okay, but a social network is also about group discussions and broadcasting.