Reddit is the fifth most popular website in the U.S. and has become a focal point when discussing the  intersection of technology and free speech. Communities on Reddit host lighter topics, ranging from financial advice to gardening. But it also has a dark side. Reddit has been known as a breeding ground for racist, sexist, and obscene dialogue. On a site where members have free reign to vote on what content is most interesting, Reddit can be viewed as a canary in the coal mine for issues that have roiled the tech world. Christine Lagorio-Chafkin, author of new book “We Are The Nerds: The Birth and Tumultuous Life of Reddit, the Internet’s Culture Laboratory” describes the origin of Reddit and what its successes and shortcomings can teach us.