Google has uploaded another video to its official YouTube channel, promoting the use of Hangouts On Air to have your voice heard in a "virtual public square". This advert in particular grabs your attention with the use of Martin Luther King Jr's famous speech, and iconic images from recent history. The narrator talks about how people have spoke out without fear in public squares, and how, with the use of Hangouts On Air, Google+ users can do the same, virtually.
Give it a watch if you're looking to be inspired: