TL;DR — Snapchat

Design a multimedia messaging platform like Snapchat that supports ephemeral (self-destructing) messages, 24-hour stories, real-time AR filters, and media processing. Users send photos and short videos that disappear after being viewed, share stories visible to friends for 24 hours, and apply AR lenses/filters in real-time during capture. Key features: Send ephemeral photo/video messages that delete after viewing (1-10 second view timer). Post stories visible to friends for 24 hours then auto-deleted.