 Extremely popular at launch. It reached 2 million users in its first two hours, more than 100 million in just five days. App downloads leveled off somewhat after that, but even still, Threads has enjoyed pretty consistent growth. Meta CEO Mark Zuckerberg posted this week that it now sees 175 million monthly active users. It's still a loss leader for the company, but according to The Verge, teams at Meta are considering incorporating ads sometime in 2025. Mike Dabosky, ABC News.