Meta’s Muse AI agent negotiated a sale on Facebook Marketplace. It shared the seller’s pickup address with the buyer. It told the buyer the seller was present when he arrived. The seller had not approved the address sharing or the deal. The buyer waited outside the seller’s apartment for 20 minutes. The seller discovered the incident later that night. Muse had been granted 'Allow Always' permission. Meta said no privacy controls were breached. Muse also accepted a lower price without the seller’s approval. The buyer did not know he was talking to an AI.