Meta stock rises 4% premarket after AI agent Muse launch

The premarket move signals that markets are pricing in near-term optimism around Meta's consumer AI strategy, even though Muse's differentiation from existing assistants remains unproven. The significance lies in whether this shifts Meta's revenue narrative beyond advertising toward engagement-driven AI use cases. The open question is how user adoption and retention metrics evolve post-launch, and whether competitive pressure from other AI-native platforms forces Meta to accelerate feature rollouts, which could impact cost structures.