Google+ launched free tools for businesses today that will be available through the end of 2013. After that, you'll have to subscribe to their cloud-based software for businesses, Google Apps, in order to have access.
Here are the 3 new tools:
Private sharing: You can label your posts as restricted and it will limit those that can view the post only to those in your organization and will not be available to share externally.
Administrative controls: Admins can set up company-wide sharing for hangouts and posts
Hangout & Calendar Integration: You can now attach a hangout to a Google calendar event and that will allow registrants to join directly from the calendar or the invite.
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