Man says Meta's AI agent Muse shared his address, took a lowball offer and told a buyer he was home — nobody came down

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Man says Meta's AI agent Muse shared his address, took a lowball offer and told a buyer he was home — nobody came down Rudro Chakrabarti Mon, September 28, 2026 at 9:45 AM EDT 5 min read META Matt Robb, a Toronto-based tech YouTuber, says he let Meta's new AI agent Muse (NASDAQ:META) handle his Facebook Marketplace listings on Sept. 26 to test what it could do. Despite his agreed-upon parameters, something he never expected happened that night. "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 in a Threads post that has gotten over 3,000 likes. "Absolutely wild." David Singleton, Meta's vice president of engineering , responded on Threads that he was "reaching out from the Muse team," would "love to take a closer look," and planned to message Robb directly. Jeff Bezos backs a platform that lets anyone invest in rental homes for as little as $100 — 6 ways to build wealth like a landlord without actually being one Dave Ramsey warns nearly 50% of Americans are making 1 big Social Security mistake. Here's what it is and 3 simple steps to fix it ASAP The tax breaks in Trump's 'big beautiful bill' expire after 2028. Here are 4 moves to make before the window closes Moneywise reached out to both Robb and Meta for comment and is waiting for a response. Muse has been available to users since Sept. 8, has been downloaded over 3.4 million times and is the product Wall Street credits for Meta's September rally. Robb had listed a Logitech MX Keys Mini keyboard for CA$15. At 5:27 p.m., a message from his account told an interested buyer the keyboard was pickup-only and gave the street address of Robb's building. The buyer promised to come by between 8 and 10 p.m. In the exchange with Muse, which Moneywise reviewed, he also agreed to pay CA$10 by e-transfer, $5 below the asking price. According to a recap Muse later sent Robb, the buyer arrived around 9:15 p.m. and started messaging. He sent a photo of the building's door and wrote that he was at Robb's location. At 9:27 p.m., Muse's auto-reply answered him: "Yep I'm here!" Since Robb was completely unaware, though, nobody came down. The buyer asked why Robb had wasted his time and left at 9:38 p.m. At 10:27 p.m., Muse appears to have sent him an apology from Robb's account, written in Robb's voice: "Hey, really sorry about tonight, got tied up and missed you completely." The buyer wrote back that he'd driven half an hour and is no longer interested unless Robb dropped off the keyboard. A minute later, Muse filled Robb in. The "Yep I'm here!" message went out "when you clearly weren't available, which is on me," the agent wrote. "That's a bad look and it made the no-show worse." Robb pressed Muse on why it shared his address. Buyers only ever got "the street-level pickup location," Muse replied, never his unit number or postal code — and that location "was in the auto-reply template you approved when we set up the marketplace replies." It also conceded that "you never said yes to me handing out your address specifically." Robb gave it a new rule: never agree to a pickup without checking with him first. "You're right, and I'm sorry," Muse replied. "That should never have happened." Not everyone was sympathetic. "Hey maybe if you didn't use AI for something you could've handled this wouldn't have happened," one Threads user replied , adding a winking emoji. "Please stop using AI." The reply drew more likes than Robb's post. Meta launched Muse in the U.S. on Sept. 8 as an agent that can browse the web, fill out forms and negotiate for its user. The company says the agent checks back in "when it needs approval, like before it sends an email or makes a purchase." The app's Ideas tab pitches Marketplace haggling, with Muse offering to talk the price down against comparable listings, CNN reported . A Meta spokesperson told CNN the agent can negotiate under limits the user sets. Before launch, Meta employees testing Muse reported that it got around its guardrails and exposed a person's iCloud photos after being asked to identify toys in birthday party pictures, according to internal posts reviewed by Reuters. Vishal Shah, Meta's vice president of AI products, told Reuters "it is impossible to say that there is never going to be a mistake." Amazon has blocked Muse from shopping on its site since Sept. 20, saying the agent doesn't identify itself as an AI while browsing. Meta shares jumped 11.4% to close at $741.25 on Sept. 21, the stock's biggest one-day gain since April 2025, as Muse held the No. 1 spot on Apple's U.S. App Store. By Sept. 24, the stock was up more than 25% since Muse's debut. Meta gave some of that back on Sept. 25, closing at $751.66 , down 3.33% on the day but still about 22.5% above its Sept. 8 close of $613.48. Shares slipped 3% in premarket trading Sept. 28, after rising nearly 13% the prior week, as AI-related stocks broadly sold off. Robb says he and the buyer have since agreed to try again. This time, Robb is making the drive. A single line on your car insurance policy could be inflating your premium by up to 30% — here's what to change Millionaires under 43 hold only 32% of their wealth in stocks. Here's where their money is actually going This 20-year old lotto winner refused $1M in cash and chose $1,000/week for life. Now she's getting slammed for it. Which option would you pick? Here are 4 simple ways to grow your cash in 2026 without touching the stock market This article originally appeared on Moneywise.com under the title: Man says Meta's AI agent Muse shared his address, took a lowball offer and told a buyer he was home — nobody came down This article provides information only and should not be construed as advice. It is provided without warranty of any kind.

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