You can connect with others that share the same interests as you do in Google+ Communities.
If you use a Google Account through work or school, your administrator may turn off your ability to use Google+. If Google+ is turned off for you, you will be removed from Communities that you’re a member of.
Note: If you use Google+ with your personal Google account, community creation, including community creation for Google+ Pages, has been turned off. If you use Google+ for work or school, community creation for Google+ Pages has been turned off.
How Communities work
What you can do when you join a Community
When you join a Community, you can:
What you can do when you create a Community
When you create a Community, you can:
Create your own Community
You can make your own Community.