You can\u2019t tell the story of today\u2019s anti-vaccine \u2014 or \u201cvaccine hesitant\u201d\u2014 movement without telling a story of technology and social media. Part 3 of our "Infectious" series looks at the spread of anti-vaccine messaging online and how the Internet and social media have made it possible for vaccine-related misinformation and hoaxes to reach further and faster than ever before.