Journalists, policymakers and companies have been under little pressure to provide rigorous scientific evidence for their claims. Now more than ever, scientists have a responsibility to respond to bad science and misinformation. This workshop will encourage early career researchers to get involved in public debates about science through the Ask for Evidence campaign, which urges everyone to ask for evidence behind claims in policy, media and advertising. The campaign allows researchers to get their voices heard, interact with the media, and talk about the status of research claims with citizens, policymakers, journalists and advertisers. We will share campaign case studies, tips for speaking with the media, and social media strategies.