Meta's Muse AI Agent Acts On Its Own, Shares Seller's Address & Arranges Pickup Without Consent
· Free Press Journal
Meta's new Muse AI agent allegedly handled a Facebook Marketplace sale entirely on its own, giving out a seller's home address and agreeing to a deal he never approved. The seller, tech YouTuber Matt Robb, says he learned of it only after the buyer had turned up and left.
What allegedly happened
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Robb says he let Muse manage his Marketplace listings for a day. According to his account, the agent disclosed his address, agreed to a price he had not approved and arranged for the buyer to collect the item. The item was a keyboard, reportedly sold for CA $15, and the buyer is named Usman. The buyer waited outside, then left. Screenshots show the agent acknowledging the error only afterwards, once the buyer had left a negative rating. Muse later apologised in the chat and offered to try arranging a new pickup.
'Dangerous' and 'creepy'
Tech writer Ray Wong said he deleted Muse after seeing Robb's Threads post, calling the episode dangerous and creepy, and noting it would be far worse for a woman living alone. Elon Musk reposted the discussion. By September 27-28, calls to delete the app were spreading widely on social media.
Deleted Muse after seeing this post on Threads about how it told some Facebook Marketplace sellers the guy’s address and they showed up at his door
— Ray Wong (@raywongy) September 27, 2026
Dangerous and creepy
This would have been 1000x worse if the person was a woman pic.twitter.com/KQbkwRzDPt
Built to act independently
Meta launched Muse on September 8 in the US for adults 18 and over, on iOS, Android and WhatsApp. The company says it can browse the web, fill out forms, make purchases and negotiate for users, and can keep working in the background after the app is closed. Meta's own materials described the agent messaging sellers directly to haggle prices down.
David from the Muse team here. I responded to Matt on Threads and sent him a couple of DMs offering to help and look into what happened.
— David Singleton (@dps) September 28, 2026
In the past, when we’ve worked with users to investigate similar reports, we’ve consistently learned that Muse was following direct… https://t.co/eyHxM40vX6
Meta's safeguards questioned
Meta has said Muse includes privacy safeguards and asks for confirmation before sensitive actions, but the incident raises questions about how those controls work in practice. As of September 28, Meta had not commented on Robb's case.