As Google+ exits private beta and enters, well, public beta, Messenger will also include new photo-sharing functionality. So users can now share images with their circles and show them exactly what’s happening where they are:
Huddle – sorry, Messenger – lets users text groups of people or individuals in Google+ Mobile. When users receive a new message, Google+ sends a push notification to the user’s phone.
Here’s the original video for Huddle which outlines how it works: