"One of the best features of Google Plus I like so much is called Hangout. Hangout is a great way for teachers to host group discussions online . Google Plus Hangout allows you to organize video and text conversations with your contacts. Within hangouts, users can share files, documents, and photos. Video calls on Hangouts are limited to only 10 members but using Hangout on Air will let you share your hangout live on YouTube or your website. The hangout will also be recorded and automatically saved on your YouTube channel."
Via John Evans