Google + is worth looking at. Circles are a good way of defining relationships and managing information flows. This is critical for teachers who can choose to include a class in a circle, while using the same account for professional and social contacts
Given I cannot be bothered with Facebook/Linked In/ Google+ all doing similar things I will likely consolidate on Google+
I hope I can trust Google in the future to manage this and other private information they currently have of mine. (Is it mine?) Hopefully, unlike NZ Government agencies, they don’t lose interest in privacy and security once it is out of the popular press and budget cuts are required.