Meta released its personal agent Muse on September 10, 2026, and it passed 10 million U.S. downloads in 40 days, with 2.5 million daily actives last week. Reporting has established that Muse clears security questions, hands over personal data, and that a poisoned link can give root access to its VM; a researcher also found a Mac app flaw that would have let a hacker reach anything a user gave Muse access to. Meta says conversations are isolated from its ad systems and is building an encrypted VM, but declined an on-the-record statement on whether Muse feeds targeted ads and on the security claim. The discussion splits on whether the convenience justifies the access, and on whether Muse is a…