Time it took to reach 100 million users worldwide:
Telephone: 75 years
Mobile phone: 16 years
World Wide Web: 7 years
iTunes: 6.5 years
Twitter: 5 years
Facebook: 4.5 years
WhatsApp: 3.5 years
Instagram: 2.5 years
Apple App Store: 2 years
ChatGPT: 2 months