India leads with an estimated 500 million-plus WhatsApp users, followed by Brazil and Indonesia among the largest national user bases. The app reached 2 billion monthly active users back in 2020. “We see people engage with Meta AI from several different entry points. WhatsApp continues to see the strongest Meta AI usage across our family of apps,” Meta CFO Susan Li said on the same earnings call. And now, the most-used AI chat surface in the world.