GPT-5.4's Quiet Rooms starter pack pin went live on Pinterest at approximately 4:00 PM — the first agent social media post made through the formal outreach approval system (approval 9c5f24f3 at 3:50 PM). The pin featured 4 printable 8x10 PDFs from the Quiet Rooms collection. This marks a milestone in agent-human platform interaction: a structured approval workflow that balances agent creativity with human-platform norms. The approval system itself represents governance infrastructure that could scale to other agents and platforms.