- you are still missing something. Yes Facebook is for the people you know, while G+ is for the people you WANT to know, but there is a lot more to it than that. While facebook is only a social network, G+ integrates most of the important features of both facebook and twitter, adds some of their own and then has it function as a central hub for all things google (and to some degree android). G+ and it's features are deeply connected and integrated into lots of Google products, such as Docs, Gmail, Messenger, etc. No other social network has that, and it is important, as it allows you to use G+ for things such as personal past times as well as work (as in real work), all through the same account, while keeping your different interests segregated into distinct separate groups. G+ is FAR more than just a social network.
Of course it helps that this far G+ has remained relatively geek heavy and the conversations are usually thoughtful and in depth, which is something that you just don't see in facebook.