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