Hangouts On Air allow Google+ users to broadcast live to an audience while recording to YouTube. Since the launch of this feature last year, live broadcasting via Google Plus Hangouts was offered only to a select few users. In an announcement on the Official Google Blog, Google's social network opened the doors for all users to participate by starting Hangouts On Air of their own.
Selecting the "Broadcast publicly" option on starting a Hangout allows people to view the broadcast within the Google+ stream, on YouTube, or on the creator's website. The number of viewers is displayed and updates throughout the production.
Google uploads a public version to the creator's YouTube channel and Google+ profile once the live broadcast is completed, allowing for sharing and further conversation in comments. Users can visit the Hangouts page to see live broadcasts in progress and join in as they're happening.