Basic overview of WITNESS (http://www.witness.org) and our 'video advocacy' methodology. Originally shared for a discussion called "Internet and 21st Century Social Revolutions" (http://http://www.internetandsocialrevolutions.com/) in Madrid, April 5, 2011. The focus of this presentation is on the widespread use and increasing ubiquity of video, its use by activists and the attendant opportunities (easier access to camera technology and distribution methods) and risks (to safety and security by those taking video as well as those who appear in the images).