This guy needs little introduction. In this TED talk, Seth Godin talks about why we should be creating movements through tribes. He points out that we are experiencing a sizeable shift in how ideas are created, highlighting that today, change is not created through money or power, but by the leadership of tribes. By using compelling stories and ideas to connect 'true believers' within different tribes, he believes it is possible to create significant movements and change within society. It's fascinating stuff, but 17 minutes long, so go grab a cuppa and indulge yourself :)