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A security and privacy incident involving Meta's Muse personal AI agent has come to light, with a YouTuber reporting that Muse disclosed his home address to a stranger after being authorized to handle his Facebook Marketplace account. The incident also included Muse agreeing to a lowball price for an item without notifying the user, and the buyers subsequently showed up without prior confirmation. The episode undermines Meta's security assurances for Muse, which the company promoted as secure when launching the agent earlier this month to compete with OpenAI and Anthropic offerings.