I seldom use Google+. Obviously, I use Google on a daily basis and recently took a TEK class and it focused on Google and its vast benefits and uses. Google+ is an easy way to connect and seems to provide an unlimited amount of connections to things that interest you.
I have recently joined several Google+ communities that suit my interests as a Social Studies teacher as well as a few pages/communities that connect to my personal interests.
Professionally, I follow the AEA Learning Online community and also a World History community that provides all sorts of "on this day in history" facts and other teaching tools I could use in my daily classroom instruction.
Kristopher"Kritter" Hayes