This book offers a structured and insightful journey through the evolving landscape of cybersecurity, focusing on the pressing challenges posed by social media and IoT ecosystems. Readers explore ML frameworks designed to detect fake news and distorted social media campaigns, followed by methods to identify fake Instagram profiles and prevent impersonation. The discussion advances into technical territory with a threat surface analysis of smart IoT cameras, offering metrics to address their unique vulnerabilities. The book concludes by introducing a novel cryptographic hash function and a comparative analysis of IoT communication protocols.