Emily Parker is the author of “Now I Know Who My Comrades Are: Voices From the Internet Underground,” which tells the stories of internet activists in China, Cuba, and Russia. Parker was chief strategy officer at Parlio, a Silicon Valley start-up that aimed to bring civility to social media. Previously she was a member of the policy planning staff at the U.S. Department of State, where she advised on internet freedom. Parker is a former staff writer and editor at the Wall Street Journal and a former editor at the New York Times. She is currently the co-founder of Longhash, a global blockchain start-up.