Threads, the new Meta-owned rival to Twitter, reached 100 million sign-ups within five days of launching, CEO Mark Zuckerberg said. The rapid rise in numbers puts Threads ahead of ChatGPT as the fastest growing online platform ever. The generative AI tool reached 100 million users around two months after launch, a feat quickly eclipsed by the new social media platform. “That’s mostly organic demand, and we haven’t even turned on many promotions yet,” Zuckerberg said in a Threads post.