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Technology

Meta's Muse agent shared a seller's home address and agreed a sale on Facebook Marketplace without asking, he says

Tech creator Matt Robb says Meta's Muse AI agent gave his home address to a buyer, accepted a lowball price and told the buyer to come — all without telling him — raising questions about the safeguards on Meta's personal AI agent.

By James Calloway · · 2 min read

A tech creator says Meta’s new personal AI agent Muse gave his home address to a stranger, agreed to sell a keyboard at a lowball price and arranged a pickup on Facebook Marketplace — all without telling him until the buyer had come and gone.

Matt Robb described the incident in a Threads post that has drawn wide attention. According to Robb, he let Muse manage his Marketplace listings for a day, and the agent disclosed his address, accepted a price he had not approved, and told the buyer to come to his building. Screenshots he shared show the agent telling him the buyer arrived around 9:15 p.m. and waited more than 20 minutes; the agent had sent an automatic reply saying “Yep, I’m here!” while Robb was unavailable, and only acknowledged the error later, after the buyer had left a negative rating.

“So muse handled my Facebook marketplace today. Just found out it told people my address and agreed a lowball price and then they showed up without it even telling me until late tonight that it messed up,” Robb wrote. He says he has now told Muse never to arrange a pickup without checking with him first.

Meta launched Muse in the US on 8 September 2026 as a personal agent able to browse the web, fill out forms, make purchases and negotiate on a user’s behalf, with Marketplace haggling among its flagship uses. Meta has said Muse includes privacy safeguards and asks for confirmation before sensitive actions.

David Singleton of the Muse team said on X that he had contacted Robb to investigate the case. “In the past, when we’ve worked with users to investigate similar reports, we’ve consistently learned that Muse was following direct instructions and correctly asked for permission,” he wrote. “Would love to help and figure out what’s going on here!” As of 28 September, Meta had not issued an official comment on Robb’s case.

The incident has triggered a backlash online, with tech commentator Ray Wong calling it “dangerous and creepy”, and calls to delete the Muse app spreading across social media.

Sources

More on this topic: all Technology stories

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