The popular social media platform that introduced the concept of "stories" is Snapchat. This feature allows users to share moments in a continuous stream of short-lived content, disappearing after 24 hours. The "stories" format has since been adopted by other platforms, including Instagram, Facebook, and WhatsApp, reflecting a shift in how users interact and share content online. This ephemeral content encourages more authentic engagement and increases user activity, contributing to the feature's massive success in social networking.