"Welcome to the 21st Century. You are a Netizen (a Net Citizen)," wrote Michael Hauben in 1993 when he discovered that along with the Internet there had emerged a new form of citizen and citizenship. He called this new form of citizen 'netizen'. The article Hauben wrote introducing his research and the concept of Netizen to the world soon became the first chapter of the book "Netizens: On the History and Impact of Usenet and the Internet". Come celebrate the 20th anniversary of this book with us.