A small advertising beat may not sustain Meta's stock after earnings if Muse cannot show durable use and paying customers to justify rising AI spending. Muse could monetize Meta's existing merchant base through subscriptions and more ad spend, but service costs and whether users keep paying remain unproven. Strong fourth-quarter guidance or firmer Muse usage and payment data would make the outlook more positive; September's rally alone does not establish a sell-the-news outcome. x.com