Learn how to design apps and services with consideration for vulnerable users in this 25-minute conference talk from ACCU 2019. Explore common threat models, focusing on users at risk from stalkers or abusive ex-partners. Discover how well-intentioned features can inadvertently provide avenues for harassment. Gain insights into identifying at-risk users and potential threats. While not offering definitive solutions, emphasize the importance of considering these issues during the design process. Cover topics including introduction, content warning, perpetrator profiles, improvement strategies, safety considerations, and a summary of key points.