The rise of social media has brought numerous benefits to society, enabling people to connect with friends, share their experiences, and stay informed. However, it has also given rise to a dark side, with individuals misusing these platforms for nefarious purposes. William "Billy" Halliday is one such example—a serial Facebook pest and stalker. This article explores the disturbing actions of Halliday and the consequences of his online harassment. William "Billy" Halliday's relentless harassment and stalking on Facebook represent the darker side of social media's influence. His actions have caused immeasurable distress and damage to his victims, highlighting the urgent need for increased online safety measures and awareness. As users, it is our responsibility to remain vigilant, report instances of abuse, and foster a community that supports and protects one another in the face of online harassment. Only by working together can we ensure a safer and more inclusive digital landscape.