I've moved my 1000+ contacts into Google+ Circles which I thought of as contact categories. Prior to creating my Google+ Circles and assigning all my contacts to the appropriate circle I checked my profile privacy settings to ensure that all settings were set to private.
I thought this was done under My Profile -> People -> Edit -> Uncheck box for showing people in your Google+ Circles.
Yet I found out that Google+ is automatically sending out an invitation email to any non Gmail contact me, telling them that I want them to join Google+.
Horribly embarrassing, some of the contacts are business related and I'd never ask them to join a social group.
How do I stop that?