learn more about cambridge analytica. >> the computer is better at understanding you better than even your friends. >> he said social media is the battle ground and you are the target. >> it weighs on me that i played a pivotal role in setting up a company and it's done a lot of harm to the democratic protests in a lot of countries. we begin this story in cambridge. it's 2013 and at the university psych metric center, they're deving into the field of facebook and sigh kol jichlt what glimpsings into the soul of your facebook might reveal. cutting edge research which chris wylie was quick to start and now helps explain. >> on social media you cure rate yourself. you put so much information about who you are in one single