Google Hangout is an excellent service that enables both one-on-one and group chats with up to ten people at a time.Google Hangouts are not all video based. You can hold a hangout using only the textual chat functionality or you can add voice. There is also another great feature called hangout on Air. A Hangout on the Air is a Google hangout that is broadcast both on YouTube both through your Google+ page . It’s a great way to have a “public” event or get more people involved in the conversation!
Via Frédéric DEBAILLEUL, Laurent Blanquer