Angelina Jolie has been one of the world's most renowned celebrity humanitarians, especially as a UNHCR special envoy who has visited countries all over the world to raise awareness.MORE: Angelina Jolie shares heartbreaking letter from teenage girl amid Afghanistan crisisShe is making a new move towards increasing her reach as an advocate with her latest career development as an author.WATCH: 90-second quiz: Test your Angelina Jolie knowledgeIn a special online event, Angelina joined three youth