Alexandr Wang, 29, was hand-picked by Mark Zuckerberg last year to oversee Meta's AI efforts. Wang, the company's first Gen Z senior executive, brings an internet-flavored communication style that could help the company connect with younger customers. He is a native of the social-media ecosystem his boss built. Wang has succeeded in building hype for Muse, in part with an unconventional internet campaign. The challenge is now to keep the momentum going as rival companies press ahead with their own offerings.