Act as a social media strategist with 5+ years of experience analyzing ephemeral content trends. Analyze the rise and fall of Twitter Fleets (2020-2021) and extract key lessons for brands considering ephemeral content strategies on [PLATFORM]. Focus on: 1) User engagement patterns compared to [STATIC_CONTENT_TYPE], 2) Why Fleets failed while [SUCCESSFUL_EPHEMERAL_PRODUCT] thrived, and 3) How to adapt these learnings for [YOUR_INDUSTRY]. Include specific metrics, psychological drivers, and platform-specific considerations. Format as a 10-tweet thread with emoji bullet points and 1 viral hook concept.